Find the HCF and LCM of 12, 15 and 21 by prime factorisation method

1.	Find the HCF and LCM of 12, 15 and 21 by prime factorisation method
Answer» L.c.m of( 12,15,21)= 2×3×2×5×7 = 6×10×7 =420 l.c.m H.c.f =3

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