What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ?

A. 97

B. 103

C. 101

D. 99

Answer: Option A

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and subtracting 1. (7×2)-1=13, (13×2)-1=25, (25×2)-1=49. The next term is (49×2)-1=97.

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? 1, 3, 9, 27, ?

A. 108

B. 72

C. 81

D. 54

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Correct Answer: Option C

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

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? 8, 13, 20, 29, 40, ?

A. 49

B. 53

C. 55

D. 51

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Correct Answer: Option B

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 40+13=53.

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, 9, 19, 33, 51, ?

A. 67

B. 69

C. 73

D. 71

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Correct Answer: Option D

Explanation:
The differences are: 6, 10, 14, 18. These are increasing by 4. The next difference is 22. Therefore, 51+22=73.

This question belongs to: Reasoning Number Series

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