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Anonymous
79 is a Prime number. There is no common factor (other than 1) with 38 (whose prime factors are 19 and 2)
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The GCF is 1.
The GCF of 38 and 76 is 38. Since 38 is a factor of 76, it is automatically the GCF.
It is: 79-38 = 41
The GCF is 2.