What will come in place of the question mark (?) in the following number series? 6, 11, 18, 27, 38, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 6, 11, 18, 27, 38, ?

A. 51

B. 53

C. 47

D. 49

Answer: Option A

Solution (By JKSSB Mock Tests)

The differences are: 5, 7, 9, 11. These are consecutive odd numbers. The next difference is 13. Therefore, 38+13=51.

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, 5, 9, 17, 33, ?

A. 65

B. 67

C. 63

D. 61

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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (3×2)-1=5, (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 #2

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What will come in place of the question mark (?) in the following number series? 6, 18, 54, 162, ?

A. 324

B. 486

C. 648

D. 810

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Correct Answer: Option B

Explanation:
Each term is multiplied by 3. Therefore, 162×3=486.

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? 10, 30, 90, 270, ?

A. 960

B. 720

C. 540

D. 810

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Correct Answer: Option D

Explanation:
Each term is multiplied by 3. Therefore, 270×3=810.

This question belongs to: Reasoning Number Series

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