What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, ?

A. 60

B. 72

C. 56

D. 64

Answer: Option A

Solution (By JKExamLibrary)

The differences are: 8, 12, 16. These are increasing by 4. The next difference is 20. Therefore, 40+20=60.

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? 5, 17, 33, 53, 77, ?

A. 99

B. 101

C. 105

D. 97

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 77+28=105.

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, 9, 28, 65, 126, ?

A. 217

B. 219

C. 215

D. 221

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Correct Answer: Option A

Explanation:
The pattern is: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65, 5³+1=126. The next term is 6³+1=217.

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? 9, 18, 36, 72, ?

A. 216

B. 108

C. 180

D. 144

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Correct Answer: Option D

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

This question belongs to: Reasoning Number Series

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