3 isn't a factor of either number.
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13 is a prime number & 27 = 3*3*3*1, so the greatest common factor of 13 and 27 would be 1, which is the only common factor.
The GCF of 3 and 19 is 1. Because 3 and 19 are both prime numbers, they have no other common factor.
The greatest common factor of 38 and 57 is 19. The prime factorization of 38 is 2*19 The prime factorization of 57 is 3*19 So the GCF is 19.
The GCF of 13 and 24 is 1.The GCF is 1.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 9 and 13 is 1