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If you mean the greatest common divisor (or factor), the answer is 6
GCD of 81 and 66 is 3.
GCD(66, 90) = 6
GCD(42, 65) = 1
The GCD of 14, 42 is 14.
GCD: 14
The GCF is 6.
GCD: 21
The Greatest Common Divisor (GCD) for 42 56 is 14.
Greatest Common Divisor (GCD) for 30 42 is 6.
GCD: 6
The GCF is 3.