Factor them.
2 x 13 = 26
3 x 13 = 39
2 x 3 x 13 = 78
Select the common factor.
The GCF is 13.
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The Greatest Common Factor of 50, 25, 26 is 1
The greatest common factor of 17 and 26 is 1.
Greatest common factor of 78 and 286 is 26.
The greatest common factor of 26 and 65 is 13.13x2=2613x5=65
The Greatest Common Factor of 10, 26, 104 is 2.