1, 3, 9, 27
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The greatest common factor of 27 and 35 is 1
One (1) is the only common factor.
Since 3 is a factor of 27, it is automatically the GCF of 3 and 27
the greatest common factor for 27 and 32 is 1
Since 27 is a factor of 189, it is automatically the GCF.