Answer
Yes, 1 is the answer because it is true that it is the Greatest Common Factor of 13 and 20.
The factors of 13 are {1, 13} and the factors of 20 are {1, 2, 4, 5, 10, 20}. The greatest common number in those sets is 1.
The Greatest Common Factor is the largest factor that is in both sets, so 1 is the answer.
Work Step by Step
The factors of 13 are {1, 13} and the factors of 20 are {1, 2, 4, 5, 10, 20}. The greatest common number in those sets is 1.
The Greatest Common Factor is the largest factor that is in both sets, so 1 is the answer.