What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ?

A. 81

B. 79

C. 77

D. 83

Answer: Option B

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

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, 10, 16, 24, ?

A. 34

B. 36

C. 30

D. 32

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Correct Answer: Option A

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 24+10=34.

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? 3, 7, 13, 21, 31, ?

A. 45

B. 41

C. 43

D. 39

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Correct Answer: Option C

Explanation:
The differences are: 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

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? 4, 6, 10, 16, 24, ?

A. 34

B. 32

C. 36

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, 24+10=34.

This question belongs to: Reasoning Number Series

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