equal numbers of vehicles turn left and turn right when ente

equal numbers of vehicles turn left and turn right when entering an intersection at a certain main highway. Draw a tree diagram which shows, for the next three vehicles entering this intersection, how many could turn left and how many could turn right. In how many cases could there be

(a)exactly two vehicles that turn left;

(b)exactly one vehicle that turn left;

(c)exactly three vehicles that turn right;

(d)exactly three vehicles that turn left?

Solution

c)exactly three vehicle that turn right;