GMAT Test Prep: PS-95032683 GMAT Problem Solving

A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probabilitythatthe2 rosebushes in the middle of the row will be the red rosebushes?