The prime factors are:
15 = 3 * 5
35 = 5 * 7
75 = 3 * 5 * 5
So the greatest common factor is 5.
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The greatest common factor of 35 and 24 is 1.
The greatest common factor of 10 , 140 = 10
The GCF is 5.
The greatest common factor of 27 and 35 is 1
The GCF is 5.