What will come in place of the question mark (?) in the following number series? 7, 8, 10, 13, 17, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 7, 8, 10, 13, 17, ?

A. 21

B. 20

C. 23

D. 22

Answer: Option D

Solution (By JKSSB Mock Tests)

The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 17+5=22.

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? 11, 17, 23, 29, ?

A. 33

B. 37

C. 35

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

Question #2

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What will come in place of the question mark (?) in the following number series? 13, 26, 52, 104, ?

A. 234

B. 156

C. 208

D. 182

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Correct Answer: Option C

Explanation:
Each term is multiplied by 2. Therefore, 104×2=208.

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? 10, 30, 60, 100, ?

A. 160

B. 140

C. 150

D. 120

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Correct Answer: Option C

Explanation:
The differences are: 20, 30, 40. These are increasing by 10. The next difference is 50. Therefore, 100+50=150.

This question belongs to: Reasoning Number Series

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