What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ?

A. 99

B. 80

C. 120

D. 100

Answer: Option A

Solution (By JKSSB Mock Tests)

The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

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, 4, 12, 48, ?

A. 288

B. 192

C. 240

D. 144

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Correct Answer: Option C

Explanation:
The pattern is: 2×2=4, 4×3=12, 12×4=48. The multipliers are increasing by 1. The next multiplier is 5. Therefore, 48×5=240.

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? 4, 8, 14, 22, ?

A. 28

B. 30

C. 32

D. 34

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Correct Answer: Option C

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 22+10=32.

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? 9, 18, 36, 72, ?

A. 108

B. 180

C. 144

D. 216

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Correct Answer: Option C

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

This question belongs to: Reasoning Number Series

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