What will come in place of the question mark (?) in the following number series? 12, 20, 30, 42, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 12, 20, 30, 42, ?

A. 58

B. 56

C. 52

D. 54

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 8, 10, 12. These are increasing by 2. The next difference is 14. Therefore, 42+14=56.

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, 7, 12, 19, 28, ?

A. 35

B. 39

C. 37

D. 41

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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

Question #2

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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. 60

B. 62

C. 64

D. 32

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Correct Answer: Option A

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 #3

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What will come in place of the question mark (?) in the following number series? 2, 12, 26, 44, 66, ?

A. 84

B. 88

C. 86

D. 92

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Correct Answer: Option D

Explanation:
The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 66+26=92.

This question belongs to: Reasoning Number Series

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