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. 60

B. 70

C. 90

D. 80

Answer: Option D

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? 20, 18, 15, 11, ?

A. 6

B. 5

C. 8

D. 7

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Correct Answer: Option A

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

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? 4, 14, 28, 46, 68, ?

A. 92

B. 90

C. 94

D. 88

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Correct Answer: Option A

Explanation:
The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 68+26=94.

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? 5, 14, 27, 44, ?

A. 61

B. 65

C. 67

D. 63

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Correct Answer: Option B

Explanation:
The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 44+21=65.

This question belongs to: Reasoning Number Series

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