The answer to this problem is simple, the Greatest Common Factor (GCF) is 27.
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The greatest common factor of 18, 39, and 45 is 3. The only non-trivial prime factors of 39 are 13 and 3. 13 is not a factor of the other numbers stated, but 3 is.
The GCF is 3.
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
The GCF is 1.