What will come in place of the question mark (?) in the following number series? 20, 10, 5, 2.5, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 20, 10, 5, 2.5, ?

A. 2

B. 0.75

C. 1.5

D. 1.25

Answer: Option D

Solution (By JKSSB Mock Tests)

Each term is divided by 2. Therefore, 2.5/2=1.25.

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, 4, 8, 14, 22, ?

A. 32

B. 36

C. 34

D. 30

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Correct Answer: Option A

Explanation:
The differences are: 2, 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 22+10=32.

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, 8, 10, 13, 17, ?

A. 21

B. 23

C. 20

D. 22

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Correct Answer: Option D

Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 17+5=22.

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? 10, 17, 26, 37, 50, ?

A. 61

B. 65

C. 67

D. 63

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Correct Answer: Option B

Explanation:
The differences are: 7, 9, 11, 13. These are consecutive odd numbers. The next difference is 15. Therefore, 50+15=65.

This question belongs to: Reasoning Number Series

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