What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ?

A. 83

B. 77

C. 79

D. 81

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

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? 6, 9, 13, 18, ?

A. 25

B. 22

C. 24

D. 23

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Correct Answer: Option C

Explanation:
The differences are: 3, 4, 5. The next difference is 6. Therefore, 18+6=24.

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? 3, 11, 27, 59, 123, ?

A. 247

B. 253

C. 251

D. 249

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59, (59×2)+5=123. The next term is (123×2)+5=251.

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? 1, 3, 9, 27, 81, ?

A. 162

B. 243

C. 324

D. 405

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Correct Answer: Option B

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

This question belongs to: Reasoning Number Series

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