180,144 and 90 by prime factorisation
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Lcm
720
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90=2×3×3×5
180=2×2×3×3×5
144=2×2×2×2×3×3
HCF=product of smallest power of common factor
HCF=2×3×3=18
LCM=product of greatest power of each prime factor
LCM=720.
180=2×2×3×3×5
144=2×2×2×2×3×3
HCF=product of smallest power of common factor
HCF=2×3×3=18
LCM=product of greatest power of each prime factor
LCM=720.
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