What will come in place of the question mark (?) in the following number series? 20, 25, 35, 50, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 20, 25, 35, 50, ?

A. 60

B. 70

C. 65

D. 75

Answer: Option B

Solution (By JKSSB Mock Tests)

The differences are: 5, 10, 15. These are increasing by 5. The next difference is 20. Therefore, 50+20=70.

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? 2, 8, 18, 32, 50, ?

A. 72

B. 68

C. 74

D. 70

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Correct Answer: Option A

Explanation:
The pattern is: 2×1²=2, 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

Question #2

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What will come in place of the question mark (?) in the following number series? 6, 18, 34, 54, 78, ?

A. 106

B. 102

C. 98

D. 100

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Correct Answer: Option A

Explanation:
The differences are: 12, 16, 20, 24. These are increasing by 4. The next difference is 28. Therefore, 78+28=106.

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, 2, 6, 24, ?

A. 120

B. 60

C. 100

D. 80

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Correct Answer: Option A

Explanation:
The pattern is: 1×1=1, 1×2=2, 2×3=6, 6×4=24. The next term is 24×5=120.

This question belongs to: Reasoning Number Series

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