find the LCM and HCF of 6 and 20 by prime factorisation method.
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6=2×3 and 20=2×2×5 hair 2 is common in both but in the factor of 20 the number of 2 is more than 6 HCF will be 2 into 2 equal to 4 and LCM will be 2 into 2 into 3 into 5 equal to 60
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