What will come in place of the question mark (?) in the following number series? 4, 7, 13, 25, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 7, 13, 25, ?

A. 55

B. 49

C. 51

D. 53

Answer: Option B

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and subtracting 1. (4×2)-1=7, (7×2)-1=13, (13×2)-1=25. The next term is (25×2)-1=49.

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? 10, 30, 60, 100, ?

A. 150

B. 120

C. 140

D. 160

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Correct Answer: Option A

Explanation:
The differences are: 20, 30, 40. These are increasing by 10. The next difference is 50. Therefore, 100+50=150.

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? 3, 9, 19, 33, 51, ?

A. 73

B. 69

C. 71

D. 67

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Correct Answer: Option C

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

Question #3

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What will come in place of the question mark (?) in the following number series? 4, 12, 36, 108, ?

A. 216

B. 540

C. 324

D. 432

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 108×3=324.

This question belongs to: Reasoning Number Series

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