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Steps to be followed:
            Step 1: arrange the given numbers in a line in any order.

            Step 2: divide the numbers by the lowest common prime number. Write the quotient below the
            numbers.
            Step 3: then divide the quotients by the lowest common prime number.
            Step 4: repeat the process till there are no common prime numbers to divide by.
            Step 5: the product of the divisors is the required HCF.

            Example 1: find the HCF of 60 and 72.
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