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33 = 1 x 3 x 11, 39 = 1 x 3 x 13, so (1 x 3 = 3) is the greatest common factor.
The GCF is 3.
The GCF is 39.
The GCF is 33.
The GCF of 39 & 14 is 1.
The GCF is 1
The GCF is: 13
The GCF of 39 & 33 is 3
66
The GCF of 33 and 66 = 33
The GCF is 1.