find the HCF of 12 15 and 30 by expressing this as a product of primes
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12 = 2×2×3
15 = 3×5
30 = 2×3×5
So,
HCF of 12,15and30 is 3
15 = 3×5
30 = 2×3×5
So,
HCF of 12,15and30 is 3
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