What will come in place of the question mark (?) in the following number series? 10, 30, 90, 270, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 10, 30, 90, 270, ?

A. 720

B. 810

C. 540

D. 960

Answer: Option B

Solution (By JKExamLibrary)

Each term is multiplied by 3. Therefore, 270×3=810.

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, 6, 12, 14, 28, 30, ?

A. 64

B. 62

C. 32

D. 60

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Correct Answer: Option D

Explanation:
The pattern alternates: +2, ×2, +2, ×2, +2, ×2. The last operation is ×2. Therefore, 30×2=60.[reference:14]

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? 1, 3, 7, 15, ?

A. 32

B. 35

C. 30

D. 31

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying the previous term by 2 and adding 1. (1×2)+1=3, (3×2)+1=7, (7×2)+1=15. The next term is (15×2)+1=31.

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. 35

B. 39

C. 41

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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