One (1), because 7 is a Prime number, so the only one possible for their common factor is 1.
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The greatest common factor of the numbers 2, 7 and 36 is 1.
Since 36 is a factor of 108, all of its factors are common.
The greatest common factor of 6 and 36 is 6. Since 6 is a factor of 36, it is automatically the GCF.
The Greatest Common Factor (GCF) is: 9
The greatest common factor of 108 and 144 is 36.