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Using prime factorization, find the HCF and LCM of 12, 15, 21.

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Using prime factorization, find the HCF and LCM of 12, 15, 21.

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Prime factors of 12, 15, 21

12 = 2 × 2 × 3 = 22 × 3

15 = 3 × 5

21 = 3 × 7

HCF (12, 15, 21) = 3

LCM (12, 15, 21) = 22 × 3× 5 × 7 = 420

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