What will come in place of the question mark (?) in the following number series? 11, 20, 33, 50, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 11, 20, 33, 50, ?

A. 67

B. 73

C. 69

D. 71

Answer: Option D

Solution (By JKSSB Mock Tests)

The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 50+21=71.

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? 6, 13, 27, 55, ?

A. 109

B. 111

C. 112

D. 110

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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (6×2)+1=13, (13×2)+1=27, (27×2)+1=55. The next term is (55×2)+1=111.

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? 2, 5, 11, 23, ?

A. 45

B. 47

C. 49

D. 51

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Correct Answer: Option B

Explanation:
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

Question #3

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What will come in place of the question mark (?) in the following number series? 4, 9, 16, 25, 36, ?

A. 42

B. 49

C. 56

D. 44

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Correct Answer: Option B

Explanation:
The series consists of squares of consecutive integers: 2², 3², 4², 5², 6². The next term is 7²=49.

This question belongs to: Reasoning Number Series

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