What will come in place of the question mark (?) in the following number series? 20, 18, 15, 11, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 20, 18, 15, 11, ?

A. 7

B. 8

C. 5

D. 6

Answer: Option D

Solution (By JKExamLibrary)

The differences are: -2, -3, -4. The next difference is -5. Therefore, 11-5=6.

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. 124

C. 126

D. 127

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Correct Answer: Option C

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? 8, 22, 40, 62, 88, ?

A. 114

B. 118

C. 108

D. 110

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Correct Answer: Option B

Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 88+30=118.

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, 12, 48, 192, ?

A. 576

B. 960

C. 384

D. 768

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Correct Answer: Option D

Explanation:
Each term is multiplied by 4. Therefore, 192×4=768.

This question belongs to: Reasoning Number Series

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