What will come in place of the question mark (?) in the following number series? 5, 15, 45, 135, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 5, 15, 45, 135, ?

A. 360

B. 270

C. 405

D. 540

Answer: Option C

Solution (By JKExamLibrary)

Each term is multiplied by 3. Therefore, 135×3=405.

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

A. 73

B. 67

C. 69

D. 71

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Correct Answer: Option D

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 #2

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What will come in place of the question mark (?) in the following number series? 5, 9, 17, 33, ?

A. 67

B. 63

C. 69

D. 65

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Correct Answer: Option D

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (5×2)-1=9, (9×2)-1=17, (17×2)-1=33. The next term is (33×2)-1=65.

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, 9, 25, 49, ?, 121

A. 72

B. 64

C. 81

D. 100

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Correct Answer: Option C

Explanation:
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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