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. 31

C. 35

D. 29

Answer: Option A

Solution (By JKSSB Mock Tests)

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? 2, 6, 10, 14, 18, ?

A. 24

B. 20

C. 26

D. 22

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Correct Answer: Option D

Explanation:
The series increases by 4 each time. Therefore, 18+4=22.

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, 6, 10, 16, 24, ?

A. 36

B. 32

C. 30

D. 34

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Correct Answer: Option D

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 24+10=34.

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, 10, 15, 22, ?

A. 35

B. 33

C. 29

D. 31

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Correct Answer: Option D

Explanation:
The differences are: 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 22+9=31.

This question belongs to: Reasoning Number Series

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