What will come in place of the question mark (?) in the following number series? 7, 21, 39, 61, 87, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 7, 21, 39, 61, 87, ?

A. 115

B. 111

C. 109

D. 107

Answer: Option A

Solution (By JKSSB Mock Tests)

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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Question #1

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What will come in place of the question mark (?) in the following number series? 4, 7, 12, 19, 28, ?

A. 37

B. 41

C. 35

D. 39

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Correct Answer: Option D

Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 28+11=39.

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? 5, 12, 20, 29, ?

A. 39

B. 38

C. 37

D. 40

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Correct Answer: Option A

Explanation:
The differences are: 7, 8, 9. The next difference is 10. Therefore, 29+10=39.

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

A. 106

B. 102

C. 98

D. 100

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Correct Answer: Option A

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

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