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 JKExamLibrary)

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? 3, 15, 35, 63, ?

A. 99

B. 80

C. 100

D. 120

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Correct Answer: Option A

Explanation:
The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

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? 4, 7, 12, 19, 28, ?

A. 41

B. 37

C. 35

D. 39

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Correct Answer: Option D

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 28+11=39.

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? 6, 13, 24, 39, ?

A. 60

B. 56

C. 54

D. 58

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Correct Answer: Option D

Explanation:
The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 39+19=58.

This question belongs to: Reasoning Number Series

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