What will come in place of the question mark (?) in the following number series? 9, 25, 49, 81, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 9, 25, 49, 81, ?

A. 100

B. 144

C. 121

D. 169

Answer: Option C

Solution (By JKSSB Mock Tests)

The series consists of squares of odd numbers: 3², 5², 7², 9². The next term is 11²=121.

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? 2, 5, 12, 27, ?

A. 54

B. 60

C. 56

D. 58

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and adding 1, then 2, then 3? Let's check: (2×2)+1=5, (5×2)+2=12, (12×2)+3=27. The next term is (27×2)+4=58.

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, 14, 30, 50, 74, ?

A. 98

B. 94

C. 96

D. 102

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Correct Answer: Option D

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 74+28=102.

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? 7, 12, 19, 28, ?

A. 39

B. 41

C. 37

D. 35

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Correct Answer: Option A

Explanation:
The differences are: 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 28+11=39.

This question belongs to: Reasoning Number Series

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