What will come in place of the question mark (?) in the following number series? 3, 8, 18, 38, ? MCQ with Answer and Explanation

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What will come in place of the question mark (?) in the following number series? 3, 8, 18, 38, ?

A. 80

B. 84

C. 82

D. 78

Answer: Option D

Solution (By JKSSB Mock Tests)

Each term is obtained by multiplying by 2 and adding 2. (3×2)+2=8, (8×2)+2=18, (18×2)+2=38. The next term is (38×2)+2=78.

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, 12, 48, 192, ?

A. 576

B. 384

C. 960

D. 768

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Correct Answer: Option D

Explanation:
Each term is multiplied by 4. Therefore, 192×4=768.

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? 8, 22, 40, 62, 88, ?

A. 110

B. 118

C. 108

D. 114

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Correct Answer: Option B

Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 88+30=118.

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, 11, 28, 53, ?

A. 82

B. 88

C. 86

D. 84

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Correct Answer: Option C

Explanation:
The differences are: 9, 17, 25. These are increasing by 8. The next difference is 33. Therefore, 53+33=86.

This question belongs to: Reasoning Number Series

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