To find the greatest common factor (GCF) of 57, 39, and 15, we need to first find the factors of each number. The factors of 57 are 1, 3, 19, and 57. The factors of 39 are 1, 3, 13, and 39. The factors of 15 are 1, 3, 5, and 15. The common factor among all three numbers is 3, making it the greatest common factor.
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The greatest common factor of 39 and 18 is definitely 3.
The GCF is 3.
The greatest common factor of 30 and 39 is 3.
The greatest common factor of 90 and 39 is 3
Greatest common factor of 39 and 104 is 13.