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. 0.75

B. 2

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? 6, 18, 54, 162, ?

A. 648

B. 486

C. 324

D. 810

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Correct Answer: Option B

Explanation:
Each term is multiplied by 3. Therefore, 162×3=486.

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, 10, 17, 26, 37, ?

A. 48

B. 50

C. 46

D. 52

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Correct Answer: Option B

Explanation:
The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 37+13=50.

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? 5, 15, 29, 47, 69, ?

A. 89

B. 87

C. 91

D. 95

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Correct Answer: Option D

Explanation:
The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 69+26=95.

This question belongs to: Reasoning Number Series

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