What will come in place of the question mark (?) in the following number series? 3, 10, 21, 36, 55, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 10, 21, 36, 55, ?

A. 74

B. 76

C. 78

D. 80

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 7, 11, 15, 19. These are increasing by 4. The next difference is 23. Therefore, 55+23=78.

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? 1, 2, 5, 14, ?

A. 41

B. 42

C. 44

D. 43

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 3 and subtracting 1. (1×3)-1=2, (2×3)-1=5, (5×3)-1=14. The next term is (14×3)-1=41.

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? 4, 14, 28, 46, 68, ?

A. 94

B. 88

C. 92

D. 90

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Correct Answer: Option C

Explanation:
The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 68+26=94.

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? 4, 6, 10, 16, 24, ?

A. 36

B. 30

C. 34

D. 32

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Correct Answer: Option C

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 24+10=34.

This question belongs to: Reasoning Number Series

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