What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, ?

A. 33

B. 35

C. 29

D. 31

Answer: Option A

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17. The next term is (17×2)-1=33.

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, 10, 20, 34, ?

A. 54

B. 48

C. 52

D. 50

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Correct Answer: Option C

Explanation:
The differences are: 6, 10, 14. These are increasing by 4. The next difference is 18. Therefore, 34+18=52.

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? 14, 27, 42, 59, ?

A. 76

B. 80

C. 82

D. 78

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Correct Answer: Option D

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

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? 8, 27, 64, 125, ?

A. 256

B. 144

C. 196

D. 216

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Correct Answer: Option D

Explanation:
The series consists of cubes of consecutive integers starting from 2: 2³, 3³, 4³, 5³. The next term is 6³=216.

This question belongs to: Reasoning Number Series

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