What will come in place of the question mark (?) in the following number series? 3, 9, 19, 33, 51, ? MCQ with Answer and Explanation

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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

Answer: Option B

Solution (By JKExamLibrary)

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

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Question #1

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What will come in place of the question mark (?) in the following number series? 5, 11, 19, 29, 41, ?

A. 55

B. 53

C. 51

D. 57

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Correct Answer: Option A

Explanation:
The differences are: 6, 8, 10, 12. These are increasing by 2. The next difference is 14. Therefore, 41+14=55.

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? 9, 18, 36, 72, ?

A. 144

B. 108

C. 180

D. 216

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Correct Answer: Option A

Explanation:
Each term is multiplied by 2. Therefore, 72×2=144.

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, 12, 36, 80, ?

A. 180

B. 160

C. 170

D. 150

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Correct Answer: Option D

Explanation:
The pattern is: 1×2=2, 2×6=12, 3×12=36, 4×20=80. The multipliers are 2,6,12,20 which are n(n+1) for n=1,2,3,4. For n=5, 5×30=150.

This question belongs to: Reasoning Number Series

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