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. 140

B. 180

C. 120

D. 160

Answer: Option D

Solution (By JKExamLibrary)

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? 5, 9, 14, 20, 27, ?

A. 33

B. 34

C. 35

D. 36

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Correct Answer: Option C

Explanation:
The differences are: 4, 5, 6, 7. The next difference is 8. Therefore, 27+8=35.

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, 18, 32, 50, ?

A. 72

B. 74

C. 70

D. 68

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Correct Answer: Option A

Explanation:
The pattern is: 2×2²=8, 2×3²=18, 2×4²=32, 2×5²=50. The next term is 2×6²=72.

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? 4, 7, 12, 19, 28, ?

A. 41

B. 39

C. 35

D. 37

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Correct Answer: Option B

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 28+11=39.

This question belongs to: Reasoning Number Series

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