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Anonymous
43 has no factors except 1 and 43.
So the greatest common factor of 43 and any multiple of 43 is 43, and
the greatest common factor of 43 and any non-multiple of 43 is 1.
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The GCF is 1.
Since 43 is a factor of 86, it is automatically the GCF.
The GCF is 3.
The gcf is 1.
The GCF is 23.