Solution
You need to calculate the prime factor of each number individually,
Hence,
24 = $$2\times 2\times 2\times 3\times 1$$
60 = $$2\times 2\times 3\times 5\times 1$$
90 = $$2\times 3\times 3\times 5\times 1$$
Common number among the set = $$2\times 3\times 1 = 6$$
Hence, the HCF = 6
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