15 is a factor of 123015.
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15625 3125,5 625,5,5 125,5,5,5 25,5,5,5,5 5,5,5,5,5,5
Since 15 is a factor of 60, it is automatically the GCF.
15 is a multiple of 5. 15 is not a factor of 25.
The greatest common factor of 15 and 105 is 15.
Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.