What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ?

A. 108

B. 180

C. 144

D. 216

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2. Therefore, 72×2=144.

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? 8, 18, 32, 50, ?

A. 74

B. 70

C. 72

D. 68

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Correct Answer: Option C

Explanation:
The pattern is: 2×2²=8, 2×3²=18, 2×4²=32, 2×5²=50. The next term is 2×6²=72.

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? 9, 25, 49, 81, ?

A. 121

B. 169

C. 144

D. 100

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Correct Answer: Option A

Explanation:
The series consists of squares of odd numbers: 3², 5², 7², 9². The next term is 11²=121.

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, 48, 192, ?

A. 576

B. 960

C. 384

D. 768

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Correct Answer: Option D

Explanation:
Each term is multiplied by 4. Therefore, 192×4=768.

This question belongs to: Reasoning Number Series

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