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To find the HCF you first need to break the numbers down into their prime factors. In this case you'd get:

3 = 3

15 = 3x5

The next step is to identify any common prime factors. In this case, the only common prime factor is 3. Therefore the HCF of 3 and 15 is 3.

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Q: How do you take out HCF of 3 and 15?
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