The GCF is 1.
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The GCF is 1.
27/3 = 9 and 51/3 = 17 so three is the greatest common factor (it's the only)
the greatest common factor for 27 and 32 is 1
The greatest common factor of 27 and 35 is 1
The greatest common factor of 75 and 27 is 3.