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. 76

B. 80

C. 74

D. 78

Answer: Option D

Solution (By JKExamLibrary)

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? 4, 16, 36, 64, ?

A. 81

B. 121

C. 144

D. 100

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Correct Answer: Option D

Explanation:
The series consists of squares of even numbers: 2², 4², 6², 8². The next term is 10²=100.

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, 16, 30, 48, 70, ?

A. 94

B. 90

C. 96

D. 92

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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, 70+26=96.

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, 5, 9, 14, 20, ?

A. 27

B. 26

C. 28

D. 25

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Correct Answer: Option A

Explanation:
The differences are: 3, 4, 5, 6. The next difference is 7. Therefore, 20+7=27.

This question belongs to: Reasoning Number Series

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