What will come in place of the question mark (?) in the following number series? 5, 8, 13, 20, 29, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 8, 13, 20, 29, ?

A. 36

B. 42

C. 40

D. 38

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 29+11=40.

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, 123, ?

A. 251

B. 249

C. 247

D. 253

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Correct Answer: Option A

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 #2

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What will come in place of the question mark (?) in the following number series? 7, 8, 10, 13, 17, ?

A. 22

B. 23

C. 20

D. 21

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Correct Answer: Option A

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 17+5=22.

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? 7, 10, 15, 22, ?

A. 29

B. 33

C. 31

D. 35

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Correct Answer: Option C

Explanation:
The differences are: 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 22+9=31.

This question belongs to: Reasoning Number Series

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