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 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? 6, 12, 20, 30, 42, ?

A. 54

B. 56

C. 58

D. 52

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Correct Answer: Option B

Explanation:
The pattern is: 1×2+4=6? Let's find differences: 6, 8, 10, 12. These are consecutive even numbers. The next difference is 14. Therefore, 42+14=56.

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? 4, 16, 32, 52, 76, ?

A. 100

B. 96

C. 104

D. 98

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 76+28=104.

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? 11, 23, 47, 95, ?

A. 189

B. 185

C. 187

D. 191

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (11×2)+1=23, (23×2)+1=47, (47×2)+1=95. The next term is (95×2)+1=191.

This question belongs to: Reasoning Number Series

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