What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ?

A. 80

B. 100

C. 120

D. 99

Answer: Option D

Solution (By JKExamLibrary)

The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

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? 6, 11, 18, 27, 38, 51, ?

A. 68

B. 64

C. 62

D. 66

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Correct Answer: Option D

Explanation:
The differences are: 5, 7, 9, 11, 13. These are consecutive odd numbers. The next difference is 15. Therefore, 51+15=66.

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, 5, 9, 17, ?

A. 35

B. 31

C. 33

D. 29

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (5×2)-1=9, (9×2)-1=17. The next term is (17×2)-1=33.

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? 2, 7, 16, 29, 46, ?

A. 63

B. 61

C. 65

D. 67

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Correct Answer: Option C

Explanation:
The differences are: 5, 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 46+21=67.

This question belongs to: Reasoning Number Series

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