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. 70

C. 90

D. 60

Answer: Option A

Solution (By JKExamLibrary)

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? 5, 12, 20, 29, ?

A. 38

B. 40

C. 37

D. 39

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Correct Answer: Option D

Explanation:
The differences are: 7, 8, 9. The next difference is 10. Therefore, 29+10=39.

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, 11, 21, 34, ?

A. 47

B. 49

C. 48

D. 50

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Correct Answer: Option D

Explanation:
The differences are: 7, 10, 13. These are increasing by 3. The next difference is 16. Therefore, 34+16=50.

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, 4, 6, 9, 13, ?

A. 19

B. 17

C. 20

D. 18

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Correct Answer: Option D

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 13+5=18.

This question belongs to: Reasoning Number Series

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