Find the hcf and lcm of 72,126&168 by prime factorisation
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72 = 2×2×2×3×3
126 = 2×3×3×7
168=2×2×2×3×7
LCM=2×2×2×3×3×7
HCF=2×3
126 = 2×3×3×7
168=2×2×2×3×7
LCM=2×2×2×3×3×7
HCF=2×3
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