What will come in place of the question mark (?) in the following number series? 1, 3, 9, 27, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 1, 3, 9, 27, ?

A. 81

B. 72

C. 54

D. 108

Answer: Option A

Solution (By JKSSB Mock Tests)

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

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? 9, 16, 25, 36, ?

A. 64

B. 81

C. 42

D. 49

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Correct Answer: Option D

Explanation:
The series consists of squares of consecutive integers starting from 3: 3², 4², 5², 6². The next term is 7²=49.

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? 3, 9, 19, 33, 51, ?

A. 69

B. 71

C. 67

D. 73

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Correct Answer: Option B

Explanation:
The differences are: 6, 10, 14, 18. These are increasing by 4. The next difference is 22. Therefore, 51+22=73.

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? 12, 24, 48, 96, ?

A. 192

B. 144

C. 168

D. 216

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 96×2=192.

This question belongs to: Reasoning Number Series

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