What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, ?

A. 48

B. 47

C. 50

D. 49

Answer: Option C

Solution (By JKSSB Mock Tests)

The differences are: 7, 10, 13. These are increasing by 3. The next difference is 16. Therefore, 34+16=50.

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? 4, 9, 19, 39, ?

A. 83

B. 81

C. 77

D. 79

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Correct Answer: Option D

Explanation:
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

Question #2

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What will come in place of the question mark (?) in the following number series? 1, 8, 27, 64, 125, ?

A. 169

B. 144

C. 216

D. 196

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Correct Answer: Option C

Explanation:
The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³, 5³. The next term is 6³=216.

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? 3, 9, 19, 33, 51, ?

A. 67

B. 73

C. 69

D. 71

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Correct Answer: Option D

Explanation:
The differences are: 6, 10, 14, 18. These are increasing by 4. The next difference is 22. Therefore, 51+22=73.

This question belongs to: Reasoning Number Series

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