What will come in place of the question mark (?) in the following number series? 3, 9, 27, 81, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 9, 27, 81, ?

A. 405

B. 162

C. 243

D. 324

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is multiplied by 3. Therefore, 81×3=243.

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? 4, 7, 13, 25, ?

A. 49

B. 53

C. 55

D. 51

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Correct Answer: Option A

Explanation:
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

Question #2

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What will come in place of the question mark (?) in the following number series? 7, 12, 19, 28, ?

A. 37

B. 41

C. 39

D. 35

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Correct Answer: Option C

Explanation:
The differences are: 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, 15, 28, 45, ?

A. 66

B. 62

C. 64

D. 60

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Correct Answer: Option A

Explanation:
The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 45+21=66.

This question belongs to: Reasoning Number Series

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