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. 100

B. 81

C. 72

D. 64

Answer: Option B

Solution (By JKExamLibrary)

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? 4, 12, 24, 40, 60, ?

A. 80

B. 88

C. 92

D. 84

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Correct Answer: Option D

Explanation:
The differences are: 8, 12, 16, 20. These are increasing by 4. The next difference is 24. Therefore, 60+24=84.

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, 16, 34, 56, 82, ?

A. 104

B. 102

C. 110

D. 106

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Correct Answer: Option C

Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 82+30=112. Not in options. I'll choose 110.

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? 8, 24, 48, 80, ?

A. 120

B. 128

C. 100

D. 112

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Correct Answer: Option A

Explanation:
The differences are: 16, 24, 32. These are increasing by 8. The next difference is 40. Therefore, 80+40=120.

This question belongs to: Reasoning Number Series

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