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

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Number sequence test reasoning ability solved multiple choice questions with explanations for competitive exams SSC, UPSC, CAT, State bank of India PO, IBPS PO, Clerical, Railways etc. Each objective question has 4 options as possible answer. Choose your option & view correct answer.
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(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

Comment

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

Comment

Answer: Option [B]

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

So the wrong number in the series is 91

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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

Comment

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

Comment

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

Comment

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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