What will come in place of the question mark (?) in the following number series? 9, 17, 27, 39, 53, ? 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, 27, 39, 53, ?

A. 71

B. 65

C. 69

D. 67

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 8, 10, 12, 14. These are increasing by 2. The next difference is 16. Therefore, 53+16=69.

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, 4, 8, 16, ?

A. 32

B. 24

C. 30

D. 64

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2 to get the next term. Therefore, the next term is 16×2=32.

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, 5, 10, 17, 26, ?

A. 35

B. 38

C. 36

D. 37

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Correct Answer: Option D

Explanation:
The pattern is: 1²+1=2, 2²+1=5, 3²+1=10, 4²+1=17, 5²+1=26. The next term is 6²+1=37.

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? 4, 12, 36, 108, ?

A. 432

B. 540

C. 324

D. 216

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 108×3=324.

This question belongs to: Reasoning Number Series

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