Madison has a choice of two entrees (soup or salad), three main courses (fish, chicken or steak) and three desserts (ice-cream, lemon tart or cheese).
c. Suppose that Madison has the choice to omit the entree and/or the dessert course altogether. Find the probability that:
i. she chooses only two courses.
I have no idea how to work this, I've been trying to 'count' on a tree diagram for hours and I don't know how they get an answer of 15/36.
I know that there are 36 choices because are extra "none" options for the entree and dessert so 3 x 3 x 4.