In a recent advertising campaign, Applebee's Restaurant offered diners a special 3-course menu for $15.99. The menu included choices of three appetizers (Mozzarella sticks, house salad, soup), four entrees (chicken, fish, beef, vegetarian pasta), and two desserts (ice cream, apple pie).

How many of these 3-course meals have the beef course as the entree?

i believe this has to do with the combinations or permutation rules.