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. 65

B. 69

C. 71

D. 67

Answer: Option B

Solution (By JKExamLibrary)

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? 1, 8, 27, 64, ?

A. 216

B. 121

C. 125

D. 100

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Correct Answer: Option C

Explanation:
The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³. The next term is 5³=125.

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? 9, 14, 20, 27, ?

A. 35

B. 39

C. 33

D. 37

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Correct Answer: Option A

Explanation:
The differences are: 5, 6, 7. The next difference is 8. Therefore, 27+8=35.

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? 3, 8, 18, 38, ?

A. 82

B. 80

C. 84

D. 78

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (3×2)+2=8, (8×2)+2=18, (18×2)+2=38. The next term is (38×2)+2=78.

This question belongs to: Reasoning Number Series

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