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

Question
What will come in place of the question mark (?) in the following number series? 3, 8, 18, 38, 78, ?
A. 152
B. 148
C. 156
D. 158
Answer: Option D
Solution (By JKExamLibrary)
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
What will come in place of the question mark (?) in the following number series? 14, 27, 42, 59, ?
A. 80
B. 82
C. 78
D. 76
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Correct Answer: Option C

Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.
This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 2, 6, 14, 30, 62, ?
A. 118
B. 126
C. 120
D. 122
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Correct Answer: Option B

Explanation:
Each term is obtained by multiplying by 2 and adding 2. (2×2)+2=6, (6×2)+2=14, (14×2)+2=30, (30×2)+2=62. The next term is (62×2)+2=126.
This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 1, 3, 7, 15, ?
A. 31
B. 35
C. 30
D. 32
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Correct Answer: Option A

Explanation:
Each term is obtained by multiplying the previous term by 2 and adding 1. (1×2)+1=3, (3×2)+1=7, (7×2)+1=15. The next term is (15×2)+1=31.
This question belongs to: Reasoning Number Series
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