What will come in place of the question mark (?) in the following number series? 5, 8, 13, 20, 29, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 8, 13, 20, 29, ?

A. 40

B. 38

C. 42

D. 36

Answer: Option A

Solution (By JKSSB Mock Tests)

The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 29+11=40.

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? 2, 10, 30, 68, ?

A. 150

B. 120

C. 140

D. 130

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Correct Answer: Option D

Explanation:
The pattern is: 1³+1=2, 2³+2=10, 3³+3=30, 4³+4=68. The next term is 5³+5=130.

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? 7, 21, 39, 61, 87, ?

A. 107

B. 115

C. 109

D. 111

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Correct Answer: Option B

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

Question #3

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What will come in place of the question mark (?) in the following number series? 2, 6, 12, 20, 30, ?

A. 40

B. 42

C. 46

D. 44

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Correct Answer: Option B

Explanation:
The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 30+12=42.

This question belongs to: Reasoning Number Series

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