What will come in place of the question mark (?) in the following number series? 4, 13, 28, 49, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 4, 13, 28, 49, ?

A. 78

B. 76

C. 74

D. 72

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 9, 15, 21. These are increasing by 6. The next difference is 27. Therefore, 49+27=76.

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, 9, 28, 65, ?

A. 126

B. 125

C. 124

D. 127

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Correct Answer: Option A

Explanation:
The pattern is: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65. The next term is 5³+1=126.[reference:8]

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? 1, 4, 9, 16, 25, ?

A. 35

B. 49

C. 36

D. 30

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Correct Answer: Option C

Explanation:
The series consists of squares of consecutive integers: 1², 2², 3², 4², 5². The next term is 6²=36.

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? 1, 3, 9, 27, ?

A. 108

B. 72

C. 81

D. 54

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Correct Answer: Option C

Explanation:
Each term is multiplied by 3. Therefore, 27×3=81.

This question belongs to: Reasoning Number Series

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