What will come in place of the question mark (?) in the following number series? 3, 7, 15, 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, 15, 31, ?

A. 67

B. 65

C. 63

D. 61

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 1. (3×2)+1=7, (7×2)+1=15, (15×2)+1=31. The next term is (31×2)+1=63.

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, 7, 13, 21, ?

A. 31

B. 35

C. 29

D. 33

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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, 21+10=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? 5, 12, 21, 32, ?

A. 45

B. 43

C. 47

D. 41

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Correct Answer: Option A

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

Question #3

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What will come in place of the question mark (?) in the following number series? 3, 10, 21, 36, ?

A. 55

B. 57

C. 53

D. 51

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Correct Answer: Option A

Explanation:
The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 36+19=55.

This question belongs to: Reasoning Number Series

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