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 JKSSB Mock Tests)

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? 7, 14, 28, 56, ?

A. 112

B. 98

C. 84

D. 126

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 56×2=112.

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? 20, 25, 35, 50, ?

A. 70

B. 60

C. 65

D. 75

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Correct Answer: Option A

Explanation:
The differences are: 5, 10, 15. These are increasing by 5. The next difference is 20. Therefore, 50+20=70.

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? 4, 9, 19, 39, ?

A. 81

B. 79

C. 77

D. 83

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

This question belongs to: Reasoning Number Series

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