What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ?

A. 216

B. 180

C. 144

D. 108

Answer: Option C

Solution (By JKExamLibrary)

Each term is multiplied by 2. Therefore, 72×2=144.

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? 6, 13, 24, 39, ?

A. 60

B. 56

C. 58

D. 54

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Correct Answer: Option C

Explanation:
The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 39+19=58.

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, 11, 28, 53, ?

A. 88

B. 82

C. 84

D. 86

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Correct Answer: Option D

Explanation:
The differences are: 9, 17, 25. These are increasing by 8. The next difference is 33. Therefore, 53+33=86.

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? 2, 12, 30, 56, ?

A. 90

B. 100

C. 110

D. 80

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Correct Answer: Option A

Explanation:
The pattern is: 1×2=2, 3×4=12, 5×6=30, 7×8=56. The next term is 9×10=90.

This question belongs to: Reasoning Number Series

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