What will come in place of the question mark (?) in the following number series? 5, 15, 45, 135, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 15, 45, 135, ?

A. 360

B. 270

C. 540

D. 405

Answer: Option D

Solution (By JKSSB Mock Tests)

Each term is multiplied by 3. Therefore, 135×3=405.

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? 3, 11, 27, 59, ?

A. 125

B. 123

C. 127

D. 121

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59. The next term is (59×2)+5=123.

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, 10, 12, 15, 19, ?

A. 25

B. 22

C. 23

D. 24

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Correct Answer: Option D

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 19+5=24.

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, 14, 18, 24, 32, ?

A. 42

B. 40

C. 44

D. 46

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Correct Answer: Option A

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 32+10=42.

This question belongs to: Reasoning Number Series

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