One is a common factor of every set of non-zero integers. Sometimes it's the only common factor. That would make it the GCF by default.
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The greatest common factor of 27 and 35 is 1
The greatest common factor is one.
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.
The Greatest Common Factor of 41, 38: 1
The greatest common factor of 60 and 70 is 10