# Ten Important Reasoning questions with answers for competitive exams

## Problem # 1

This reasoning problem consists of three figures and every figure have three numbers associated to it . So the solution of this problem is to find the value of question mark using other two numbers associated to it .
But the problem is how to utilised these two numbers to get the value of this question mark?
Now we have to find or search the  formula for these two numbers in each figure to utilised them in any possible way to get third number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula :- The sum of  two numbers which are on the perpendicular lines is equal to third number of triangle in every figure.
( 13 + 19 ) ÷ 8 = 32 ÷ 8 = 4 ( 3rd number in 1st triangle )
( 71 + 9 ) ÷ 8 = 80 ÷ 8 =  10 ( 3rd number in 1st triangle )
( 128 + 32 ) ÷ 8 = 160  ÷ 8 = 20 ( 3rd number in 1st triangle )
Option (2)20  is correct option

## Problem # 2

This reasoning problem consists of three figures and every figure have five numbers associated to it . So the solution of this problem is to find the value of question mark using other four numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula :- The sum of  product of left & right and sum of lower and upper numbers in each figure is equal to middle number in every figure.
( 6 × 7 ) + ( 8 + 4 ) = 42 + 12 = 54 ( Middle number in 1st figure ) .
( 8 × 4 ) + ( 12 + 7 ) = 32 + 19 = 51 ( Middle number in 2nd figure ) .
( 9 × 5 ) + ( 14 + 9 ) = 45 + 23 = 68 ( Middle number in 3rd figure ) .
Option (2)68 is correct option

## Problem # 3

This reasoning problem consists of two figures and every figure have five numbers associated to it . So the solution of this problem is to find the value of question mark using other four numbers associated to it .
But the major problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st figures . Since this figure have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in 1st figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula :- The difference of  product of both the numbers in upper row and product of both the numbers in lower row is equal to middle number in every figure.
( 11 × 12 ) - ( 6 × 9 ) = 132 - 54 = 78 (Middle number in 1st figure )
( 14 × 10 ) - ( 7 × 8 ) = 140 - 56 = 84 (Middle number in 2nd figure)
Option (1)84 is correct option

## Problem # 4

This reasoning problem consists of only one figure and this figure have eight numbers associated to it . So the solution of this problem is to find the value of question mark using other numbers associated to it .
But the major problem is how to utilised these four numbers to get the value of this question mark?
Formula :- Sum of  twice of any number in the inner circle and its adjoining number taken in clockwise order is equal to number in the outer cirle.
( 3 × 2 ) + 4 (number when moving from  3 clockwise ) = 6 + 4 = 10 ( Number in the outer circle )
( 4 × 2 ) + 6 (number when moving from 3 clockwise ) = 8 + 6 = 14 ( Number in the outer circle )

( 6 × 2 ) + 8 (number when moving from  3 clockwise ) = 12 + 8 = 20 ( Number in the outer circle )

( 8 × 2 ) + 3  (number when moving from 3 clockwise ) = 16 + 3 = 19 ( Number in the outer circle )
Option (1)19 is correct option

## Problem # 5

This reasoning problem consists of three figures and every figure have six numbers associated to it . So the solution of this problem is to find the value of question mark using other five numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . Since these figures have some values in middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula :- The product of top three numbers in any figure is equal to product of other three numbers in every figure.
(4 × 3 × 5 ) = 60 =  ( 20 × 3 × 1 )  ( Multiplication of top three numbers is equal to multiplication  of bottom three numbers ) .
(2 × 4 × 5 )  = 40 =  ( 10 × 2 × 2 )  ( Multiplication of top three numbers is equal to multiplication  of bottom three numbers ) .
( 8 × 6 × 1 ) = 48 =  ( ? × 3 × 4 ) =  Multiplication of top three numbers is equal to multiplication  of bottom three numbers ) .
? = 48 ÷  12
? = 4
Option (1)4 is correct option

## In these type of reasoning problems 2nd number will be obtained from 1st number either by using one mathematical operation/ set of mathematical operations or by using any mathematical operation/ set of mathematical operations to individual digits of 1st number. Same  mathematical operation/ set of mathematical operations  or formula will be used in 3rd number to get fourth number.
Formula :-  (1st digit  ×2nd digit÷  middle digit  = 2nd number
( 5  × 6  ) ÷ 2 = 30 ÷ 2 = 15
( 8  ×  3 ) ÷ 3 = 24 ÷ 3 = 8
Option (1)8 is correct option

## In these type of reasoning problems 2nd number will be obtained from 1st number either by using one mathematical operation/ set of mathematical operations or by using any mathematical operation/ set of mathematical operations to individual digits of 1st number. Same  mathematical operation/ set of mathematical operations  or formula will be used in 3rd number to get fourth number.
Formula :-  Reversing the digits of square root of 1st number = 2nd number
(√289 )= 17  ⇔ 71 (After reversing the order of digits )
√ (144 )= 12 ⇔ 21 (After reversing the order of digits )
Option (3)21 is correct option

Start
End

## In these type of reasoning problems 2nd number will be obtained from 1st number either by using one mathematical operation/ set of mathematical operations or by using any mathematical operation/ set of mathematical operations to individual digits of 1st number. Same  mathematical operation/ set of mathematical operations  or formula will be used in 3rd number to get fourth number.

Formula :-  1st digit ^  2nd digit =  2nd number

Taking 1st digit as base and and digit as power then after expansion we have

2^6 = 64

3 ^5 = 243

Option (1)243 is correct option

## Problem # 9 This reasoning problem consists of only one figure and this figure have eight numbers associated to it . So the solution of this problem is to find the value of question mark using other numbers associated to it .
But the major problem is how to utilised these four numbers to get the value of this question mark?

Formula :- ( Any number   × Opposite of number already chosen ) + 1 = 61

(10 × 6) +1 = 60 +1 = 61(Middle number)

(15 × 4) +1 = 60 +1 = 61(Middle number)

(5 × ? ) +1 = 60 +1 = 61(Middle number)

(5 × ? ) +1 = 61

(5 × ? )  = 60

?   = 60 ÷ 5

?  = 12

Option (2)12 is correct option

## Problem # 10

This reasoning problem consists of only one figure and this figure have eight numbers associated to it . So the solution of this problem is to find the value of question mark using other numbers associated to it .

But the major problem is how to utilised these four numbers to get the value of this question mark?

Formula :- ( Any number   + Opposite of number already chosen ) + 13 = 71

(23 + 35 ) + 13 = 58 + 13 = 71(Middle number)

(41 + 17 ) + 13 = 58 + 13 = 71(Middle number)

(46 + ? ) + 13 =   71(Middle number)

46 + ?  =   71 - 13

46 + ? =   58

? = 58 - 46

? = 12

Option (2)12 is correct option
In this post I discussed Ten Tricky logical reasoning questions+answers , Latest reasoning questions with answers  . Comment your valuable suggestion for further improvement.

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# Ten Figure problems in reasoning with answers for competitive exams

## Problem #1 This reasoning problem consists of three figures and every figure have five number associated to it . Four numbers are at the corner of each figure and one number is at the centre of the figure. Look at last figure ,it have ? in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula :- The middle Number in each figure is one tenth of product of remaining numbers.
Solution:-
( 4 × 5 × 7 × 6 ) ÷ 10 = 840 ÷ 10 = 84 ( Middle number in 1st figure).
(2 × 8 × 4 × 5 ) ÷ 10 = 320 ÷ 10 = 32 ( Middle number in 2nd figure).
(5 × 6 × 9 × 2 )÷ 10 = 540 ÷ 10 = 54 ( Middle number in 3rd figure).
Option (1) 54 is correct option

## Problem #2 This reasoning problem also consists of three figures and every figure have five number associated to it . Four numbers are at the corner of each figure and one number is at the centre of the figure. Look at last figure ,it have ? in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
But the main problem is how to use these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula:-
:- The middle Number in each figure is two less than the sum of remaining numbers.
Solution:-
(4 + 5 + 7 + 6 ) - 2 = 22 - 2 = 20 ( Middle number in 1st figure).
(2 + 8 + 4 + 7 ) - 2 = 21 - 2 = 19 ( Middle number in 2nd figure).
(5 + 6 + 9 + 8 ) - 2 = 28 - 2 = 26 ( Middle number in 3rd figure),
Option (4) 26 is correct option

## Problem #3 This reasoning problem also have three figures and every figure have five number attached to it . Four numbers are at the corner of each figure and one number is at the middle of the same figure.             Since last figure have question mark in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula:- [{Left number × Top most number } + Right number ] - bottom number.
Solution:-
{(4 × 5) + 7 }- 20 = ( 20 + 7 ) - 20 = 27 - 20 = 7 ( Middle number in 1st figure) .
{(2 × 8 ) + 4} - 12 = ( 16 + 4 ) - 12 = 20 - 12 = 8 ( Middle number in 2nd figure).
{(4 × 12 ) + 12} - 51 = ( 48 + 12 ) - 51 = 60 - 51 = 9 ( Middle number in 3rd figure).
Option (2)9 is correct option

## Problem #4 This reasoning problem also have three figures and every figure have five number attached to it . Four numbers are at the corner of each figure and one number is at the middle of the same figure.
Since 2nd figure have question mark in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st and 3rd figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to 2nd figure to find out the value of question mark.
Formula:-[{Left number × Top most number } + Right number ] - bottom number.
Solution:-
{(4 × 5 ) + 7 } - 16 = ( 20 + 7 ) - 16 = 27 - 16 = 11 ( Middle number in 1st figure).
{(4 × 12 ) + 1} - 33 = ( 48 + 1 ) - 33 = 49 - 33 = 16 ( Middle number in 3rd figure) .
{(2 × 8 ) + 3} - 12 = ( 16 + 3 ) - 12 = 19 - 12 = 7 ( Middle number in 2nd figure) . The value of question mark.
Option (4)7 is correct option

## Problem #5

This reasoning problem also have three figures and every figure have five number attached to it . Four numbers are at the corner of each figure and one number is at the middle of the same figure.             Since last figure have question mark in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
But the biggest problem is how to utilised these four numbers to get the value of this question mark?
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula:-   Add 1 to all the numbers in upper rows of each figure  to multiply the number opposite to it.
Solution:-
( 7 + 1) × 5 = ( 9 + 1) × 5 = 40 (Middle number in 1st figure )
( 17 + 1) × 3 = ( 8 + 1) × 6 = 54 (Middle number in 2nd figure )
( 10 + 1) × 6 = ( 21 + 1) × 3 = 66 (Middle number in 3rd figure ).
Option (4)66  is correct option

## - This reasoning problem also have three figures and every figure have five number attached to it . Four numbers are at the corner of each figure and one number is at the middle of the same figure.             Since last figure have question mark in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula:-   Add 1 to all the numbers of each figure  to multiply the number opposite to it.
Solution:-
( 9 +1  ) × ( 3 + 1 ) = ( 9 + 1 ) × ( 3 + 1 ) =  10  × 4  = 40 ( Middle number in 1st figure )
( 26 +1 ) × ( 1 + 1 ) = ( 8 + 1 ) × ( 5 + 1 ) = 27 × 2 = 40 ( Middle number in 2nd figure ).
15 + 1  ) × ( 2 + 1 ) = ( 3 + 1 ) × ( 11 + 1 ) =  16  × 3 = 48 ( Middle number in 3rd figure).
Option (3)48 is correct option

## Problem #7

This reasoning problem also have three figures and every figure have five number attached to it . Four numbers are at the corner of each figure and one number is at the middle of the same figure.             Since last figure have question mark in its centre . So the solution of this problem is to find the value of question mark using four numbers associated to it .
Now watch carefully the 1st two figures . since these figures have some values of middle numbers.
Now we have to find or search the  formula for these four numbers in each figure to utilised them in any possible way to get middle or central number.
The same formula will be applicable to third figure to find out the value of question mark.
Formula:-  Product of both numbers in upper lines - Product of both numbers in lower lines   ⇔ Reverse order of both digits to get Middle number
Solution:-
( 8  × 6 ) - ( 3 × 4 )  = 48 - 12 =  36  ⇔ 63
( 7  × 6 ) - ( 5 × 6 )  = 42 - 30 =  12  ⇔ 21
( 5 × 7 ) - ( 9 × 2 ) = 35 - 18 = 17 ⇔ 71
Option (1)71 is correct option

## Problem #8

This problem consists of two figures . Each figure have three numbers. In 1st figure a number in the last row have been written using other two numbers given in same figure with the help of any mathematical operation. This mathematical operation may be addition, subtraction,multiplication, division, combinations of any two operations or any other two or three operations.
Formula:- Number in Lower row = { Number in upper row - Number in middle row } × 2.
Twice the difference of two numbers in upper and middle row is equal to number in lower row.
(486 - 361 ) × 2 =  125 × 2 = 250
(395 - 279 ) × 2 =  116  × 2 = 232
Option (3)232 is correct option

## This problem consists of two figures . Each figure have three numbers. In 1st figure a number in the last row have been written using other two numbers given in same figure with the help of any mathematical operation. This mathematical operation may be addition, subtraction,multiplication, division, combinations of any two operations or any other two or three operations.
Formula:- Number in Lower row = { Number in middle row - Number in upper row } × 6.
Six times the difference of two numbers in middle and upper row is equal to number in lower row.
( 555 - 444 ) × 6 = 111 × 6 = 666
( 765 - 543 ) × 6 = 222 × 6 = 1332
Option (4)1332 is correct option

## This problem also consists of two figures . Each figure have three numbers. In 1st figure a number in the last row have been written using other two numbers given in same figure with the help of any mathematical operation. This mathematical operation may be addition, subtraction, multiplication, division, combinations of any two operations or any other two or three operations.
Formula:- Number in Lower row = Reversing the order of digits of the number of { Number in upper row - Number in middle row }.
Reverse the the digits of number obtained for difference of two numbers in upper and middle row is equal to number in lower row.
( 597 - 276 )  = 291 ⇔  192 (After reversing the digits of 291)
( 683 - 436 )  = 147 ⇔  741 (After reversing the digits of 741)
Option (3)741 is correct option

In this post I discussed Ten Tricky logical reasoning questions+answers , Latest reasoning questions with answers  . Comment your valuable suggestion for further improvement.

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## Reasoning questions with answers for competitive exams

Ten most important reasoning questions with answers for competitive exams, reasoning questions with answers for bank exams, Reasoning tricks for competitive exams have been discussed in this article for upcoming competitive exams.

## Question #1

There are three figures in this problem. Every figure consists of three numbers one in the top of the figure and two numbers are in the bottom line. In every figure the number in the top of the figure is made up of remaining two numbers which are in the bottom line. The number in the top of the figure can be calculated by using any mathematical operations with the help of remaining two numbers. The mathematical operation we use to calculate the number in the 1st figure must be same in all the remaining two figures.

Formula :- Difference of squares of numbers in the two branches of given figure is equal to number in the top of the same figure.

a² - b² = c (Number to be calculated)

1st Figure

16² - 7² = 256 - 49 = 207

2nd Figure

12² - 8² = 144 - 64 = 80

3rd Figure

25² - 21² = 625 - 441 = 184 (The value of question mark)

Option (2)184 is correct option

## Question #2

This box problem consists of four rows and five columns. To find the value of question marks in fifth column of fourth row we have to combine two columns at a time and then take the difference of combination two other rows.

Formula :- The difference of product of 1st and 4th column and sum of 2nd and 3rd column.

(Number in 1st column * Number in 4th column ) - (Number in 2nd column + Number in 3rd column) = Number in 5th column

( 4 × 2 ) - ( 5 + 3 ) = 8 - 8 = 0 (1st row 4th column)

( 7 × 4 ) - ( 3 + 4 ) = 28 - 7 = 21(2nd row 4th column)

( 6 × 5 ) - ( 4 + 4 ) = 30 - 8 = 22(3rd row 4th column)

( 9 × 5 ) - ( 6 + 5 ) = 45 - 11 =  34 = ? (The value of question mark)

Option (2)34 is correct option

## This box problem consists of four rows and three columns. To find the value of question marks in 2nd column of fourth row we have to combine three rows at the same time.

Formula :- The sum of cube of Numbers in 1st, 2nd and 3th rows is equal to Number in 4th row

( Cube of Number in 1st row  Number  ) + ( Cube of Number in 2nd row  ) (Cube of Number in 3rd row )  = Number in 4th row

2³ + 1³ + 3³ = 8 + 1 + 27 = 36 (4th row 1st column)

0³ + 4³ + 3³ = 0 + 64 + 27 = 91 (4th row 3rd column)

4³ + 2³ + 1³ = 64 + 8 + 1 = 73 = ? (4th row 2nd column)

Option (D)73  is correct option

## Question #4

This box problem also consists of four rows and three columns. To find the value of question marks in 4th row of 3rd column we have to combine three rows at the same time.

Formula :- Sum of Product of hundred times of number in 2nd row and product of numbers in 1st and 3th rows is equal to Number in 4th row

100 × ( Number in 2nd row ) + ( Number in 1st row  ) ×  ( Number in 3rd row )  = Number in 4th row

(5 × 100) + ( 7 × 10 ) = 500 + 70 =  570 (4th row 1st column)

(3 × 100) + ( 8 × 11 ) = 300 + 88 = 388 (4th row 2nd column)

(1 × 100) + ( 2 × 9 ) = 100 + 18 = 118 (The value of question mark)

Option (B)118 is correct option

## Question #5

Starting from 1 and moving in such a way that all the numbers must be written in increasing order as written in the following line as
1 , 5 , 13  ,29  , 61 , 125 , ?
Now we have to think the formula for the numbers , which is 3 more than the twice of previous number.
Formula :-
Any number = ( 2 × previous number ) + 3.

(1 × 2 ) + 3 = 2 + 3 = 5
(5 × 2 ) + 3 = 10 + 3 = 13
(13 × 2 ) + 3 = 26 + 3 = 29
(29 × 2 ) + 3 = 58 + 3 = 61
(61 × 2 ) + 3 = 122 + 3 = 125
(125 × 2 ) + 3 = 250 + 3 = 253 = ? ( The value of question mark ) .
Option (3)253  is correct option

## Question #6

Starting from 1 and moving in such a way that all the numbers must be written in increasing order as written in the following line as
1 , 3 , 9 ,31 , 129 , 651 , ?
Formula :-
Any number = ( 2 × previous number ) + 3.
(1 × 1 ) + 2 = 1 + 2 = 3
(3 × 2 ) + 3 = 6 + 3 = 9
(9 × 3 ) + 4 = 27 + 4 = 31
(31 × 4 ) + 5 = 124 + 5 = 129
(129 × 5 ) + 6 = 645 + 6 = 651
(651 × 6 ) + 7 = 3906 + 7 = 3913 = ?
Option (1)3913 is correct option

## Question #7

This box problem also consists of four rows and three columns. To find the value of question marks in 4th row of 3rd column we have to combine three rows at the same time.
Formula :- The  product of Numbers in 1st, 2nd and 3th rows is equal to Number in 4th row
2 × 4 × 5 = 40 (4th row 1st column)
3 × 7 × 2 = 42 (4th row 2nd column)
4 × 6 × 9 = 216 ( The value of question mark)
Option (B)216 is correct option

## Question #8

This box problem consists of three rows and three columns. To find the value of question marks in 3rd row of 3rd column we have to combine 1st two rows at the same time with the help of any or combination of mathematical operations.
Formula :- The  square of half of the sum of numbers in 1st and 2nd rows in any particular column is equal to Number in 3rd row
[(25 + 15) ÷ 2 ]² = [ 40 ÷ 2 ]² =  [ 20 ]² = 400
[(16 + 10) ÷ 2 ]² = [ 16 ÷ 2 ]² = [ 13 ]² = 169
[(40 + 20) ÷ 2 ]² = [ 60 ÷ 2 ]² =  [ 30 ]² = 900
Option (A)900 is correct option

## Question #9

Since the question mark is in the middle of 3rd figure. So the value of question mark will be calculated with the help of remaining four numbers around this figure in the same way, the middle numbers in 1st and 2nd figure can be calculated with the help of remaining four numbers around each figure. This question mark value can be be found by two methods.

1st Method

( 52 - 41 ) + 5 = 11 + 5 = 16 ( Middle number in 1st figure )

( 92 - 85 ) + 5 = 7 + 5 = 12 ( Middle number in 2nd figure )

( 126 -  113 ) + 5 = 13 + 5 = 18 ( Middle number in 3rd figure )

Option (3)18 is correct option

2nd Method

[(4 + 2) - (5+ 1) + 16]= (6 - 6) + 16 = 0+16 = 16 (Middle number in 1st figure )

[(8 + 2) - (9 + 5) + 16]= (10 - 14) + 16 = -4+16 = 12 (Middle number in 2nd figure )

[(11+ 6 ) - (12+ 3) + 16]= (17 - 15) + 16 = 2+16 = 18 (Middle number in 3rd figure )

Option (3)18 is correct option

## Question #10

1st Box

Product of numbers in three small boxes is equal to number in 4th box

4 × 3 × 2 = 24

2nd Box

Product of numbers in three small boxes is equal to number in 4th box

(-2) × 2 × (-1)=  4

3rd Box

Product of numbers in three small boxes is equal to number in 4th box

0 × 6 × 5 = 0    ( The value of ?  )

Option (4)0  is correct option

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## Missing number series questions and answers, Missing Number Series Questions for SBI Clerk

Ten most important Missing number series questions and answers, Number Series Questions for SBI Clerk ,SBI PO with solution , for SSC GL , SSC CHSL , RRB NTPC and other competitive Exams  have been discussed in this post.  These types of series questions are asked in many other competitive exams like SI, CPO and various entrance exams.

## Problem #1

This problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order or in any other format.

## Formula :-

Every term is the product of its two precceding terms.

1st number = 3
2nd number = 3
3rd number = ( 1st number )×( 2nd number ) = 3 × 3 = 9
4th number = ( 2nd number )×( 3rd number ) = 3 × 9 = 27
5th number = ( 3rd number )×( 4th number ) = 9 × 27 = 243
6th number = ( 5th number )×( 4th number ) = 243 × 27 = 6561
Option (4)6561 is correct option

## This problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order. This reasoning problem can be solved by two method . we shall discuss both these methods one by one.

Method #1

35 -15 = 20 (Here difference of 1st and 2nd term is 20)

63 - 35 = 28 (Here difference of 2nd and 3rd term is 20 + 8 = 28, i.e. 8 more than previous difference)

99 -63 = 36 (Here difference of  3rd and 4th term is 28 + 8 = 36, i.e. 8 more than previous difference)

143 - 99 = 44 (Here difference of  4th and  5th term is 36 + 8 = 44, i.e. 8 more than previous difference)

? - 143 = 52 (Here difference of  5th and  6th term must be  44 + 8 = 52, i.e. 8 more than previous difference)

⇒  ? = 52 + 143 = 195

Option (2)195 is correct option

Method #2

All these terms are one less than perfect squares of even numbers.

4² - 1 = 16 -1 = 15

6² - 1 = 36 -1 = 35

8² - 1 = 64 -1 = 63

10² - 1 = 100 -1 = 99

12² - 1 = 144 -1 = 143

14² - 1 = 196 -1 = 195

Option (2)195 is correct option

## This reasoning problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order. The value of question mark can be found using the difference of two of its previous terms. And after analysing  the difference so obtained we can find the value of question mark.
13 - 6 = 7
27 - 13 = 14
55 - 27 = 28
111 - 55 = 56
?  - 111 = 112
⇒ ? = 112 + 111
⇒ ? = 223
Option (3)223 is correct option

## This reasoning problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order.
1st number = 8
2nd number = (1st number  × 1 ) + 1
( 8 × 1 ) + 1 = 8 + 1 = 9
3rd number = ( 2nd number × 2 ) + 2
( 9 × 2 ) + 2 = 18 + 2 = 20
4th number = ( 3rd number × 3 ) + 3
( 20 × 3 ) + 3 = 60 + 3 = 63
5th number = ( 4th number × 4 ) + 4
( 63 × 4 ) + 4 = 252 + 4 = 256
6th number = ( 5th number × 5 ) + 5
( 256 × 5 ) + 5 = 1280 + 5 = 1285
Option (2)1285 is correct option

## These numbers are in binary number system. So 1st of all convert these numbers to decimal number system.

11(binary number system) = 3 (decimal number system) .

100(binary number system) = 4 (decimal number system)

111(binary number system) = 5  (decimal number system)

Similarly

1000(binary number system) = 6 (decimal number system)

Option (2)1000 is correct option

## Problem #6

This reasoning problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order.
(9 × 1) - 2 = 9 - 2 = 7 ( 2nd Number )
(7 × 2) - 3 = 14 - 3 = 11 ( 3rd Number )
(11 × 3) - 4 = 33 - 4 = 29 ( 4th Number )
(29 × 4) - 5 = 116 - 5 = 111 ( 5th Number )
(111 × 5) - 6 = 555 - 6 = 549 ( 6th Number )  = value of question mark
Option (4)549 is correct option

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## Problem #7

This reasoning problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order.
57 - 56 = 1= 1²
56- 55 = 1 = 1³
55 - 51 = 4 = 2²
51 - 43 = 8 = 2³
43 - 34 = 9 = 3²
Similarly ? - 34 = 4² = 16
? - 34 = 16
? = 16 + 34
? = 50
Option (2)50 is correct option

## This reasoning problem is a series problem where we have to find the value of question mark using all its previous terms means by analysing the trend of all its terms whether they are in increasing order or decreasing order. The value of question mark can be found using the difference of two of its previous terms. And after analysing  the difference so obtained we can find the value of question mark.
336 - 224 = 112
224 - 168 = 56
168  - 140 = 28
140 - 126 = 14
Similarly continuing in the same pattern
126 - ? = 7
⇒-? = 7 - 126
⇒? = -7  + 126
⇒? = 119
Option (3)119 is correct option

## Sum of both the digits of 30 ⇒ 3 + 0 = 3
Sum of both the digits of  27 ⇒ 2 + 7 = 9
Sum of both the digits of 36 ⇒ 3 + 6 = 9
Sum of both the digits of  45 ⇒ 4 + 5 = 9
Sum of both the digits of  72 ⇒ 7 + 2 = 9
All the numbers except 30 have have it's digits sum equal to 9. Only the number 30 have it's digits sum equal to 3 . So 30 is the odd number and it must be out.
Option (2)30 is correct option
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## Problem #10

1st series
5 , 7 , 10 , 14 ,
Difference 2 , 3 , 4 , 5
2nd series
6 , 8 , 11 , ?
Difference 2, 3, 4
Hence ? = 15
Option (3)15 is correct option
Ten most important Missing number series questions and answers, Number Series Questions for SBI Clerk ,SBI PO with solution  for SSC GL , SSC CHSL , RRB NTPC and other competitive Exams were discussed in this post.  comment your valuable suggestions regarding this post and for further improvement.
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