What will come in place of the question mark (?) in the following number series? 1, 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? 1, 3, 9, 27, 81, ?

A. 405

B. 162

C. 243

D. 324

Answer: Option C

Solution (By JKExamLibrary)

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? 5, 8, 13, 20, 29, ?

A. 38

B. 36

C. 40

D. 42

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Correct Answer: Option C

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 29+11=40.

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? 2, 11, 28, 53, ?

A. 86

B. 84

C. 82

D. 88

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Correct Answer: Option A

Explanation:
The differences are: 9, 17, 25. These are increasing by 8. The next difference is 33. Therefore, 53+33=86.

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? 5, 11, 23, 47, ?

A. 95

B. 93

C. 97

D. 99

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (5×2)+1=11, (11×2)+1=23, (23×2)+1=47. The next term is (47×2)+1=95.

This question belongs to: Reasoning Number Series

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