What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, 31, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, 31, ?

A. 43

B. 39

C. 41

D. 45

Answer: Option A

Solution (By JKExamLibrary)

The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

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? 7, 10, 15, 22, ?

A. 31

B. 29

C. 35

D. 33

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Correct Answer: Option A

Explanation:
The differences are: 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 22+9=31.

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, 10, 16, 24, ?

A. 34

B. 30

C. 36

D. 32

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Correct Answer: Option A

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 24+10=34.

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? 2, 5, 11, 23, ?

A. 47

B. 45

C. 51

D. 49

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (2×2)+1=5, (5×2)+1=11, (11×2)+1=23. The next term is (23×2)+1=47.

This question belongs to: Reasoning Number Series

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