1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
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The highest factor of 72 is 72.
72 is not a factor of 18; 18 is a factor of 72.
6 is not a prime number but it is a factor of 72
2 is a common factor of 24 and 72.
Since 18 is a factor of 72, it is automatically the GCF.