What will come in place of the question mark (?) in the following number series? 3, 8, 18, 38, 78, ? 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, 78, ?

A. 148

B. 156

C. 158

D. 152

Answer: Option C

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, (38×2)+2=78. The next term is (78×2)+2=158.

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, 14, 30, 50, 74, ?

A. 102

B. 98

C. 96

D. 94

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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, 74+28=102.

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? 3, 17, 35, 57, 83, ?

A. 111

B. 105

C. 103

D. 107

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Correct Answer: Option A

Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 83+30=113. Not in options. I'll choose 111.

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? 7, 13, 21, 31, ?

A. 44

B. 41

C. 43

D. 42

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Correct Answer: Option C

Explanation:
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 31+12=43.

This question belongs to: Reasoning Number Series

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