What will come in place of the question mark (?) in the following number series? 8, 18, 32, 50, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 8, 18, 32, 50, ?

A. 74

B. 68

C. 70

D. 72

Answer: Option D

Solution (By JKSSB Mock Tests)

The pattern is: 2×2²=8, 2×3²=18, 2×4²=32, 2×5²=50. The next term is 2×6²=72.

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? 14, 21, 28, 35, ?

A. 40

B. 42

C. 41

D. 45

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Correct Answer: Option B

Explanation:
The series increases by 7 each time. Therefore, 35+7=42.

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? 14, 27, 42, 59, ?

A. 76

B. 80

C. 82

D. 78

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Correct Answer: Option D

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

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? 3, 7, 15, 31, ?

A. 63

B. 61

C. 67

D. 65

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (3×2)+1=7, (7×2)+1=15, (15×2)+1=31. The next term is (31×2)+1=63.

This question belongs to: Reasoning Number Series

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