Since 12 is a factor of 72, all of its factors are common.
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The greatest factor is 72 which is a factor of 72 (though not of 60).
12 is the greatest common factor of 12,72 and 60
The GCF is 12.
LCM(24, 60, 72) = 360.A common factor is 2.
The GCF is 12.