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 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? 4, 16, 32, 52, 76, ?

A. 98

B. 100

C. 104

D. 96

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Correct Answer: Option C

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 76+28=104.

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? 5, 9, 14, 20, 27, ?

A. 35

B. 33

C. 36

D. 34

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Correct Answer: Option A

Explanation:
The differences are: 4, 5, 6, 7. The next difference is 8. Therefore, 27+8=35.

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, 11, 27, 59, 123, ?

A. 253

B. 247

C. 251

D. 249

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59, (59×2)+5=123. The next term is (123×2)+5=251.

This question belongs to: Reasoning Number Series

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