Winnie, the nice lady in charge of the cafeteria, has a stupendous idea for the school picnic: "Let's make sundaes!" Lauren, James, and Emily help out and are amazed by how many different kinds of sundaes you can make with just two ice-cream flavors, two sauces, and two types of toppings. But when supplies run low, the number of combinations changes.

Determining how many different combinations can be made from given sets of items is an important first step in understanding probability.