What will come in place of the question mark (?) in the following number series? 10, 20, 40, 80, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 10, 20, 40, 80, ?

A. 160

B. 140

C. 120

D. 180

Answer: Option A

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2. Therefore, 80×2=160.

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, 8, 15, 24, 35, ?

A. 50

B. 52

C. 46

D. 48

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 35+13=48.

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, 15, 24, 35, ?

A. 46

B. 50

C. 48

D. 52

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Correct Answer: Option C

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 35+13=48.

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? 7, 14, 23, 34, ?

A. 45

B. 49

C. 43

D. 47

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Correct Answer: Option D

Explanation:
The differences are: 7, 9, 11. These are increasing by 2. The next difference is 13. Therefore, 34+13=47.

This question belongs to: Reasoning Number Series

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