What will come in place of the question mark (?) in the following number series? 2, 12, 36, 80, ? 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, 36, 80, ?

A. 180

B. 170

C. 150

D. 160

Answer: Option C

Solution (By JKExamLibrary)

The pattern is: 1×2=2, 2×6=12, 3×12=36, 4×20=80. The multipliers are 2,6,12,20 which are n(n+1) for n=1,2,3,4. For n=5, 5×30=150.

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, 15, 31, 63, ?

A. 125

B. 127

C. 123

D. 121

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (7×2)+1=15, (15×2)+1=31, (31×2)+1=63. The next term is (63×2)+1=127.

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, 8, 27, 64, ?

A. 216

B. 125

C. 100

D. 121

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Correct Answer: Option B

Explanation:
The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³. The next term is 5³=125.

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? 12, 24, 48, 96, ?

A. 192

B. 168

C. 216

D. 144

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 96×2=192.

This question belongs to: Reasoning Number Series

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