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. 158

C. 156

D. 152

Answer: Option B

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? 3, 5, 9, 17, 33, ?

A. 65

B. 61

C. 63

D. 67

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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? 7, 16, 29, 46, ?

A. 65

B. 67

C. 69

D. 63

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Correct Answer: Option B

Explanation:
The differences are: 9, 13, 17. These are increasing by 4. The next difference is 21. Therefore, 46+21=67.

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? 12, 24, 48, 96, ?

A. 168

B. 144

C. 216

D. 192

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2. Therefore, 96×2=192.

This question belongs to: Reasoning Number Series

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