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To find the HCF of two numbers you first have to express them as a product of their prime factors. In this case:

15 = 3x5

39 = 3x13

The next step is to identify any common prime factors. In this case, both numbers have 3 as a prime factor. Therefore the HCF of 15 and 39 is 3.

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12y ago
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Q: What is HCF of 15 and 39?
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