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To find the HCF, you first have to express both numbers as the product of their prime factors:
15 = 3x5
20 = 2x2x5
The next step is to identify any common prime factors. In this case both numbers have a 5 as a prime factor. Therefore the HCF of 15 and 20 is 5.
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Q: What are the HCF of 15 and 20?
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