What will come in place of the question mark (?) in the following number series? 2, 5, 11, 23, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 2, 5, 11, 23, ?

A. 45

B. 51

C. 47

D. 49

Answer: Option C

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and adding 1. (2×2)+1=5, (5×2)+1=11, (11×2)+1=23. The next term is (23×2)+1=47.

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, 6, 12, 20, 30, ?

A. 44

B. 46

C. 40

D. 42

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Correct Answer: Option D

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

Question #2

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

A. 1.5

B. 1.25

C. 0.75

D. 2

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Correct Answer: Option B

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

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, 9, 14, 20, 27, ?

A. 34

B. 33

C. 35

D. 36

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Correct Answer: Option C

Explanation:
The differences are: 4, 5, 6, 7. The next difference is 8. Therefore, 27+8=35.

This question belongs to: Reasoning Number Series

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