What will come in place of the question mark (?) in the following number series? 2, 12, 30, 56, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 2, 12, 30, 56, ?

A. 90

B. 100

C. 110

D. 80

Answer: Option A

Solution (By JKExamLibrary)

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

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Question #1

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What will come in place of the question mark (?) in the following number series? 3, 5, 9, 17, ?

A. 35

B. 33

C. 29

D. 31

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17. The next term is (17×2)-1=33.

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? 6, 18, 34, 54, 78, ?

A. 98

B. 100

C. 106

D. 102

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 78+28=106.

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? 3, 12, 27, 48, 75, ?

A. 100

B. 102

C. 104

D. 108

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Correct Answer: Option D

Explanation:
The pattern is: 3×1²=3, 3×2²=12, 3×3²=27, 3×4²=48, 3×5²=75. The next term is 3×6²=108.

This question belongs to: Reasoning Number Series

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