题目:
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 probability that the 2 rosebushes in the middle of the row will be the red rosebushes?
选项:
A、1/12
B、1/6
C、1/5
D、1/3
E、1/2
答案:
B