What is the HCF of and ?
Answer and explanation
Correct answer: C. 3
- Step 1: List the factors of both numbers: factors of 18 are [1, 2, 3, 6, 9, 18], and factors of 15 are [1, 3, 5, 15].
- Step 2: Identify the common divisors shared by both 18 and 15: [1, 3].
- Step 3: Select the greatest common divisor: .
Answer
3.
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