What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, 123, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, 123, ?

A. 251

B. 247

C. 249

D. 253

Answer: Option A

Solution (By JKSSB Mock Tests)

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

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Question #1

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What will come in place of the question mark (?) in the following number series? 7, 12, 19, 28, ?

A. 37

B. 35

C. 41

D. 39

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 28+11=39.

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, 5, 8, 12, 17, ?

A. 22

B. 23

C. 21

D. 24

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Correct Answer: Option B

Explanation:
The differences are: 2, 3, 4, 5. The next difference is 6. Therefore, 17+6=23.

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? 2, 7, 16, 29, 46, ?

A. 65

B. 61

C. 67

D. 63

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Correct Answer: Option A

Explanation:
The differences are: 5, 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 46+21=67.

This question belongs to: Reasoning Number Series

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