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. 69

C. 65

D. 67

Answer: Option B

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, 9, 28, 65, ?

A. 125

B. 127

C. 124

D. 126

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Correct Answer: Option D

Explanation:
The pattern is: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65. The next term is 5³+1=126.[reference:8]

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? 1, 4, 9, 16, ?

A. 36

B. 20

C. 25

D. 30

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Correct Answer: Option C

Explanation:
The series consists of squares of consecutive integers: 1², 2², 3², 4². The next term is 5²=25.

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. 324

B. 216

C. 540

D. 432

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Correct Answer: Option A

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

This question belongs to: Reasoning Number Series

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