What will come in place of the question mark (?) in the following number series? 5, 10, 20, 40, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 10, 20, 40, ?

A. 80

B. 90

C. 70

D. 60

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2. Therefore, 40×2=80.

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? 4, 16, 32, 52, 76, ?

A. 100

B. 96

C. 98

D. 104

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Correct Answer: Option D

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 76+28=104.

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, 17, 33, 65, ?

A. 123

B. 125

C. 121

D. 129

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (9×2)-1=17, (17×2)-1=33, (33×2)-1=65. The next term is (65×2)-1=129.

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, 6, 14, 30, 62, ?

A. 122

B. 118

C. 120

D. 126

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (2×2)+2=6, (6×2)+2=14, (14×2)+2=30, (30×2)+2=62. The next term is (62×2)+2=126.

This question belongs to: Reasoning Number Series

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