What will come in place of the question mark (?) in the following number series? 9, 17, 33, 65, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 9, 17, 33, 65, ?

A. 121

B. 125

C. 123

D. 129

Answer: Option D

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and subtracting 1. (9×2)-1=17, (17×2)-1=33, (33×2)-1=65. The next term is (65×2)-1=129.

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, 13, 28, 49, ?

A. 76

B. 78

C. 74

D. 72

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Correct Answer: Option A

Explanation:
The differences are: 9, 15, 21. These are increasing by 6. The next difference is 27. Therefore, 49+27=76.

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, 6, 18, 54, ?

A. 162

B. 216

C. 108

D. 324

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3 to get the next term. Therefore, 54×3=162.[reference:10]

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? 7, 12, 19, 28, ?

A. 35

B. 39

C. 41

D. 37

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Correct Answer: Option B

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

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