Help with GCF and Monomials?

Question

There are three monomials such that the greatest common factor of the first and second monomials is 2xy, and the greatest common factor of the second and third monomials is 2x2y. The greatest common factor of the three monomials is?

Answer 1

2xy  and  2x2y     what is common (the same) in both?

 

2                         only one 2 is in both of them

x                         in both of them

y                         in both of them

 

2xy GCF