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25: 1, 5, 2533: 1, 3, 11, 33The greatest common factor is 1.
The GCF is 33.
The GCF is 1.
The numbers are coprime, ie their gcf is 1.
66
The GCF of 33 and 66 = 33
The GCF is 11.
The GCF is 3.