What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 7, 13, 21, ?

A. 35

B. 29

C. 31

D. 33

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 21+10=31.

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? 14, 27, 42, 59, ?

A. 76

B. 82

C. 78

D. 80

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Correct Answer: Option C

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

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? 2, 6, 11, 17, ?, 32

A. 24

B. 23

C. 22

D. 28

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Correct Answer: Option A

Explanation:
The differences are: 4, 5, 6, 7, 8. The missing term is 17+7=24.[reference:16]

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? 9, 14, 20, 27, ?

A. 39

B. 37

C. 33

D. 35

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Correct Answer: Option D

Explanation:
The differences are: 5, 6, 7. The next difference is 8. Therefore, 27+8=35.

This question belongs to: Reasoning Number Series

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