The GCF is 1.
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The greatest common factor of 39 and 18 is definitely 3.
What is the greatest common factor of 9, 18, and 15.The answer is....3
The Greatest Common Factor (GCF) of 3 and 18 is: 3
The greatest common factor of 18 21 and 42 is 3.
The greatest common fator of 51 abd 18 is 3.