What will come in place of the question mark (?) in the following number series? 8, 13, 20, 29, 40, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 8, 13, 20, 29, 40, ?

A. 55

B. 51

C. 49

D. 53

Answer: Option D

Solution (By JKSSB Mock Tests)

The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 40+13=53.

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? 13, 26, 52, 104, ?

A. 208

B. 234

C. 182

D. 156

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 104×2=208.

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, 17, 33, 53, 77, ?

A. 99

B. 105

C. 97

D. 101

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Correct Answer: Option B

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 77+28=105.

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, 14, 30, ?

A. 56

B. 62

C. 58

D. 46

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (2×2)+2=6, (6×2)+2=14, (14×2)+2=30. The next term is (30×2)+2=62.

This question belongs to: Reasoning Number Series

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