What will come in place of the question mark (?) in the following number series? 5, 11, 23, 47, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 11, 23, 47, ?

A. 97

B. 95

C. 93

D. 99

Answer: Option B

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 1. (5×2)+1=11, (11×2)+1=23, (23×2)+1=47. The next term is (47×2)+1=95.

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? 5, 8, 12, 17, ?

A. 21

B. 22

C. 23

D. 24

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Correct Answer: Option C

Explanation:
The differences are: 3, 4, 5. The next difference is 6. Therefore, 17+6=23.

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, 13, 27, 45, 67, ?

A. 87

B. 93

C. 89

D. 85

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Correct Answer: Option B

Explanation:
The differences are: 10, 14, 18, 22. These are increasing by 4. The next difference is 26. Therefore, 67+26=93.

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? 11, 17, 23, 29, ?

A. 35

B. 37

C. 33

D. 31

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Correct Answer: Option B

Explanation:
The series consists of consecutive prime numbers. The next prime number after 29 is 31? Wait, 31 is prime. But 37 is also prime. Let's check: 11, 17, 23, 29 are primes. The next prime after 29 is 31. So the answer is 31.

This question belongs to: Reasoning Number Series

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