1, as it is the only factor they share.
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GCD(25, 30) = 5
Greatest Common Divisor (GCD) for 20 30 is 10.
Greatest Common Divisor (GCD) for 30 80 is 10.
Greatest Common Divisor (GCD) for 5 30 is 5.
Greatest Common Divisor (GCD) for 30 42 is 6.