The gcd of any pair of numbers which includes 1 must be 1.
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1 is the greatest common divisor of seven and two.
1
54 is the greatest common factor of 54 and 108 since it is the largest common factor in both. 1*54 = 54 2 * 54 = 108
The Greatest Common Factor of 15, 35, 54: 1
The GCF is 1.