What will come in place of the question mark (?) in the following number series? 5, 13, 25, 41, 61, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 13, 25, 41, 61, ?

A. 83

B. 85

C. 81

D. 87

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 8, 12, 16, 20. These are increasing by 4. The next difference is 24. Therefore, 61+24=85.

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? 24, 30, 36, 42, ?

A. 54

B. 60

C. 50

D. 48

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Correct Answer: Option D

Explanation:
The series increases by 6 each time. Therefore, 42+6=48.

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? 10, 20, 30, 40, 50, ?

A. 65

B. 70

C. 55

D. 60

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Correct Answer: Option D

Explanation:
The series increases by 10 each time. Therefore, 50+10=60.

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? 1, 6, 15, 28, ?

A. 42

B. 45

C. 40

D. 48

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Correct Answer: Option B

Explanation:
The pattern is: 1×1=1, 2×3=6, 3×5=15, 4×7=28. The next term is 5×9=45.

This question belongs to: Reasoning Number Series

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