What will come in place of the question mark (?) in the following number series? 2, 3, 6, 11, 18, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 2, 3, 6, 11, 18, ?

A. 25

B. 29

C. 31

D. 27

Answer: Option D

Solution (By JKSSB Mock Tests)

The differences are: 1, 3, 5, 7. These are consecutive odd numbers. The next difference is 9. Therefore, 18+9=27.

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? 9, 17, 33, 65, ?

A. 121

B. 125

C. 129

D. 123

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Correct Answer: Option C

Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (9×2)-1=17, (17×2)-1=33, (33×2)-1=65. The next term is (65×2)-1=129.

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? 2, 4, 8, 14, 22, 32, ?

A. 42

B. 46

C. 44

D. 40

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Correct Answer: Option C

Explanation:
The differences are: 2, 4, 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 32+12=44.

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, 9, 19, 33, 51, ?

A. 69

B. 67

C. 71

D. 73

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Correct Answer: Option C

Explanation:
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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