What will come in place of the question mark (?) in the following number series? 5, 11, 19, 29, 41, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 11, 19, 29, 41, ?

A. 53

B. 55

C. 51

D. 57

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 6, 8, 10, 12. These are increasing by 2. The next difference is 14. Therefore, 41+14=55.

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? 10, 30, 60, 100, 150, ?

A. 220

B. 210

C. 200

D. 180

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Correct Answer: Option B

Explanation:
The differences are: 20, 30, 40, 50. These are increasing by 10. The next difference is 60. Therefore, 150+60=210.

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, 5, 14, 30, 55, ?

A. 91

B. 90

C. 85

D. 80

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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 #3

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What will come in place of the question mark (?) in the following number series? 1, 3, 7, 15, ?

A. 31

B. 35

C. 32

D. 30

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Correct Answer: Option A

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

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