What is the answer to this The work that Ryan did to find the greatest common factor of 48 and 72 is shown below. Prime factorization of 48: 2 x 2 x 2 x 2 x 3
Prime factorization of 72: 2 x 2 x 2 x 3 x 3

The greatest common factor is 2 ´ 2 ´ 2 ´ 3 x 3

What is Ryan’s error?
Ryan did not add the common prime factors to get the greatest common factor.
Ryan did not list all the factors in the prime factorization of 48.
Ryan did not list all the factors in the prime factorization of 72.
Ryan did not include only common prime factors in the greatest common factor.