What will come in place of the question mark (?) in the following number series? 1, 8, 27, 64, 125, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 1, 8, 27, 64, 125, ?

A. 144

B. 216

C. 196

D. 169

Answer: Option B

Solution (By JKSSB Mock Tests)

The series consists of cubes of consecutive integers: 1³, 2³, 3³, 4³, 5³. The next term is 6³=216.

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, 20, 40, 80, ?

A. 160

B. 140

C. 120

D. 180

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 80×2=160.

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? 6, 13, 27, 55, ?

A. 110

B. 112

C. 111

D. 109

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Correct Answer: Option C

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 #3

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What will come in place of the question mark (?) in the following number series? 7, 13, 21, 31, ?

A. 43

B. 44

C. 42

D. 41

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Correct Answer: Option A

Explanation:
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

This question belongs to: Reasoning Number Series

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