What will come in place of the question mark (?) in the following number series? 2, 6, 12, 20, 30, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 2, 6, 12, 20, 30, ?

A. 40

B. 44

C. 42

D. 46

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 30+12=42.

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? 12, 18, 26, 36, ?

A. 50

B. 48

C. 46

D. 44

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Correct Answer: Option B

Explanation:
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 36+12=48.

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? 11, 22, 55, 165, ?

A. 577.5

B. 325.5

C. 333.5

D. 495.5

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Correct Answer: Option A

Explanation:
The pattern is: 11×2=22, 22×2.5=55, 55×3=165. The multiplier increases by 0.5 each time. The next multiplier is 3.5. Therefore, 165×3.5=577.5.[reference:11]

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, 9, 27, 81, ?

A. 162

B. 324

C. 243

D. 405

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 81×3=243.

This question belongs to: Reasoning Number Series

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