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 JKSSB Mock Tests)

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? 7, 19, 35, 55, 79, ?

A. 99

B. 107

C. 103

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, 79+28=107.

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? 50, 49, 47, 44, ?

A. 40

B. 41

C. 42

D. 43

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Correct Answer: Option A

Explanation:
The differences are: -1, -2, -3. The next difference is -4. Therefore, 44-4=40.

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, 4, 8, 16, 32, ?

A. 56

B. 72

C. 48

D. 64

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 32×2=64.

This question belongs to: Reasoning Number Series

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