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To find the HCF of two numbers, you first have to express them as the product of their prime factors. In this case we have:
6 = 2x3
90 = 2x3x3x5
The next step is to identify any common factors. In this case both numbers have a 2 and a 3 as a prime factor. Multiply these and you get 6. Thus the HCF of 6 and 90 is 6.
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