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. 6

B. 7

C. 8

D. 5

Answer: Option A

Solution (By JKSSB Mock Tests)

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? 3, 5, 9, 17, ?

A. 31

B. 35

C. 29

D. 33

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17. The next term is (17×2)-1=33.

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, 8, 27, 64, ?

A. 216

B. 100

C. 121

D. 125

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Correct Answer: Option D

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 #3

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What will come in place of the question mark (?) in the following number series? 2, 7, 16, 29, 46, ?

A. 65

B. 61

C. 63

D. 67

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Correct Answer: Option A

Explanation:
The differences are: 5, 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 46+21=67.

This question belongs to: Reasoning Number Series

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