What will come in place of the question mark (?) in the following number series? 6, 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? 6, 12, 20, 30, 42, ?

A. 56

B. 58

C. 52

D. 54

Answer: Option A

Solution (By JKSSB Mock Tests)

The pattern is: 1×2+4=6? Let's find differences: 6, 8, 10, 12. These are consecutive even numbers. 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? 1, 5, 14, 30, 55, ?

A. 91

B. 80

C. 85

D. 90

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Correct Answer: Option A

Explanation:
The differences are: 4, 9, 16, 25. These are squares of consecutive integers: 2², 3², 4², 5². The next difference is 6²=36. Therefore, 55+36=91.

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, 13, 20, 29, 40, ?

A. 53

B. 49

C. 55

D. 51

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Correct Answer: Option A

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 40+13=53.

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, 8, 32, 128, ?

A. 256

B. 384

C. 640

D. 512

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Correct Answer: Option D

Explanation:
Each term is multiplied by 4. Therefore, 128×4=512.

This question belongs to: Reasoning Number Series

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