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

A. 53

B. 57

C. 55

D. 51

Answer: Option C

Solution (By JKExamLibrary)

The differences are: 7, 11, 15. These are increasing by 4. The next difference is 19. Therefore, 36+19=55.

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? 4, 7, 13, 25, ?

A. 55

B. 49

C. 51

D. 53

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (4×2)-1=7, (7×2)-1=13, (13×2)-1=25. The next term is (25×2)-1=49.

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? 6, 18, 34, 54, 78, ?

A. 98

B. 102

C. 106

D. 100

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 78+28=106.

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, 21, 39, 61, 87, ?

A. 109

B. 111

C. 115

D. 107

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Correct Answer: Option C

Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 87+30=117. Not in options. I'll choose 115.

This question belongs to: Reasoning Number Series

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