What will come in place of the question mark (?) in the following number series? 1, 9, 25, 49, ?, 121 MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 1, 9, 25, 49, ?, 121

A. 72

B. 81

C. 100

D. 64

Answer: Option B

Solution (By JKSSB Mock Tests)

The series consists of squares of odd numbers: 1², 3², 5², 7², 9², 11². The missing term is 9²=81.[reference:18]

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? 10, 30, 60, 100, 150, ?

A. 220

B. 210

C. 200

D. 180

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Correct Answer: Option B

Explanation:
The differences are: 20, 30, 40, 50. These are increasing by 10. The next difference is 60. Therefore, 150+60=210.

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? 10, 30, 90, 270, ?

A. 960

B. 540

C. 810

D. 720

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 270×3=810.

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, 11, 17, 25, ?

A. 39

B. 35

C. 37

D. 33

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Correct Answer: Option B

Explanation:
The differences are: 4, 6, 8. These are increasing by 2. The next difference is 10. Therefore, 25+10=35.

This question belongs to: Reasoning Number Series

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