Find HCF and LCM for 15,12,and 21 from prime factorization method
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HCF - 3 , LCM - 420
Step-by-step explanation:
15 = 3 × 5
12 = 3 × 2 × 2
21 = 3 × 7
here, only 3 is common. so, HCF = 3
LCM = HCF × uncommon factors
= 3 × 5 × 2 × 2 × 7
= 420
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