What will come in place of the question mark (?) in the following number series? 6, 13, 27, 55, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 6, 13, 27, 55, ?

A. 110

B. 111

C. 112

D. 109

Answer: Option B

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and adding 1. (6×2)+1=13, (13×2)+1=27, (27×2)+1=55. The next term is (55×2)+1=111.

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? 6, 11, 18, 27, 38, ?

A. 53

B. 49

C. 47

D. 51

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 38+13=51.

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? 2, 6, 14, 30, 62, ?

A. 122

B. 120

C. 118

D. 126

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (2×2)+2=6, (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? 1, 3, 9, 27, ?

A. 81

B. 54

C. 108

D. 72

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3. Therefore, 27×3=81.

This question belongs to: Reasoning Number Series

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