The probability of selecting an adventure movie is 2/x.
To calculate the probability, we need to determine the number of favorable outcomes (the number of adventure movies) and the total number of possible outcomes (the total number of movies on Cher's shelf).
Given that there are 2 adventure movies on Cher's shelf, and the total number of movies is not specified, we can represent the total number of movies as "x."
Therefore, the probability of selecting an adventure movie is:
Number of Adventure Movies / Total Number of Movies
= 2 / x
Since we don't have the specific value of "x," we cannot reduce the fraction further. The probability of selecting an adventure movie is 2/x.