How to find hcf of a number
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The highest common factor is found by multiplying all the factors which appear in both lists: So the HCF of 60 and 72 is 2 × 2 × 3 which is 12. The lowest common multiple is found by multiplying all the factors which appear in either list: So the LCM of 60 and 72 is 2 × 2 × 2 × 3 × 3 × 5 which is 360.
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first take 2 number such as 8 and 12 now
take the prime factorization of the number
8 = 2 × 2 ×2
12 = 2 × 2×3
now take the common from both (8,12)= 2×2 = 4
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