Christy is a movie reviewer. There are 6 new movies opening this weekend. she only has time to see 4 of them, so she asks her colleague Ignatiy to review two of them. How many sets of 4 out of the 6 movies can Christy choose to review?

Christy is a movie reviewer There are 6 new movies opening this weekend she only has time to see 4 of them so she asks her colleague Ignatiy to review two of th class=