The greatest common factor is 18.
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The mistake is that there is a greater common factor than 18. It's 36. 36 divides 36 evenly. 36 divides 72 evenly.
The least common multiple of 18 , 24 , 36 = 72
Since 18 is a factor of 72, it is automatically the GCF.
The greatest common factor of 36, 54, and 72 is 1818 2*18 = 36 3*18 = 54 4*18 = 72
The LCM is 72.