What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, 31, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, 31, ?

A. 45

B. 41

C. 43

D. 39

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

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? 2, 12, 30, 56, ?

A. 80

B. 100

C. 110

D. 90

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Correct Answer: Option D

Explanation:
The pattern is: 1×2=2, 3×4=12, 5×6=30, 7×8=56. The next term is 9×10=90.

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? 3, 12, 27, 48, ?

A. 75

B. 60

C. 72

D. 63

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Correct Answer: Option A

Explanation:
The pattern is: 3×1²=3, 3×2²=12, 3×3²=27, 3×4²=48. The next term is 3×5²=75.

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. 86

C. 92

D. 88

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Correct Answer: Option C

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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