Question

HCF & LCM of 12,15,21

Answer 1

Factors of 12=2×2×1×3,15=3×1×5,21=3×1×7.Now LCM= products of prime factors with highest power. So, LCM=2×2×3×5×7=420.HCF=Product of common terms with lowest power. 3×1=3.