What is the greatest common divisor (GCD) of 105, 135, and 180?
A5
B15
C25
D35
Explanation
105 = 15*7, 135 = 15*9, 180 = 15*12. The greatest common divisor among all three is 15.
Exam Relevance
- Topic: Number System
- Subtopic: HCF / GCD

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