What will come in place of the question mark (?) in the following number series? 7, 15, 31, 63, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 7, 15, 31, 63, ?

A. 127

B. 121

C. 125

D. 123

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 1. (7×2)+1=15, (15×2)+1=31, (31×2)+1=63. The next term is (63×2)+1=127.

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? 2, 5, 9, 14, 20, ?

A. 25

B. 27

C. 28

D. 26

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Correct Answer: Option B

Explanation:
The differences are: 3, 4, 5, 6. The next difference is 7. Therefore, 20+7=27.

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? 7, 10, 15, 22, 31, ?

A. 42

B. 40

C. 38

D. 44

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Correct Answer: Option A

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 31+11=42.

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? 5, 12, 21, 32, ?

A. 41

B. 45

C. 47

D. 43

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Correct Answer: Option B

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 32+13=45.

This question belongs to: Reasoning Number Series

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