What will come in place of the question mark (?) in the following number series? 4, 7, 13, 25, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 7, 13, 25, ?

A. 49

B. 55

C. 51

D. 53

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and subtracting 1. (4×2)-1=7, (7×2)-1=13, (13×2)-1=25. The next term is (25×2)-1=49.

This question belongs to: Reasoning Number Series

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Question #1

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What will come in place of the question mark (?) in the following number series? 5, 8, 13, 20, 29, ?

A. 42

B. 38

C. 40

D. 36

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Correct Answer: Option C

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 29+11=40.

This question belongs to: Reasoning Number Series

Question #2

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What will come in place of the question mark (?) in the following number series? 6, 14, 30, 62, ?

A. 124

B. 122

C. 126

D. 128

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (6×2)+2=14, (14×2)+2=30, (30×2)+2=62. The next term is (62×2)+2=126.

This question belongs to: Reasoning Number Series

Question #3

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What will come in place of the question mark (?) in the following number series? 4, 6, 12, 14, 28, 30, ?

A. 62

B. 60

C. 64

D. 32

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Correct Answer: Option B

Explanation:
The pattern alternates: +2, ×2, +2, ×2, +2, ×2. The last operation is ×2. Therefore, 30×2=60.[reference:14]

This question belongs to: Reasoning Number Series

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