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Number Sequence Test - Analytical Reasoning Aptitude Questions and Answers for IBPS Bank Exams

Questions
1 In the following number series only one number is wrong. Find out the wrong number.

6, 11, 20, 32, 42, 56, 72

A 11
B 20
C 32
D 56

Answer: Option [C]
The pattern is 22 + 2, 32 + 3, 42 + 4, 52 + 5, 62 + 6, 72 + 7, 82 + 8

So the wrong number is 32

2 In the following number series only one number is wrong. Find out the wrong number.

6, 10, 18, 30, 46, 66, 91, 120

A 18
B 91
C 30
D 120

Answer: Option [B]

The pattern is + 4, +8, 12, +16, +20, +24, +30

So the wrong number in the series is 91

In each of the following questions a number series is given. Below the number series a number is given. This number is followed by A, B, C, D and E. Using the same pattern as in the original series answer the questions.

3   8   12,  32,  108,  448,  2260

      3     A    B      C      D        E

What will be come in place of C ?

A 36
B 56
C 78
D 328

Answer: Option [D]

The pattern is x 1 + 4, x 2 + 8, x 3 + 12, x 4 + 16, x 5 + 20

So, 3 x 1 + 4 = 7

So, 7 x 2 + 8 = 22

So, 22 x 3 + 12 = 78

So, 78 x 4 + 16 = 328 which replaces C

4   5,    4,    10,    27,   77,   380

       6     A     B      C     D     E

What will be come in place of D ?

A 395
B 80
C 21
D 8

Answer: Option [B]

The pattern is x 1 - 1, x 2 - 2, x 3 - 3, x 4 - 4, x 5 - 5

So, 6 x 1 - 1 = 5

So, 5 x 2 - 2 = 8

So, 8 x 3 - 3 = 21

So, 21 x 4 - 4 = 80 which replaces D

5 What will come in place of question mark in the following number series ?

1, 3, 7, 15, ?, 63, 127

A 22
B 25
C 29
D 31

Answer: Option [D]

The pattern is

21 - 1 = 1

22 - 1 = 3

23 - 1 = 7

24 - 1 = 15

25 - 1 = 31

26 - 1 = 63

27 - 1 = 127

So, 31 will replace the question mark.

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