Billy is picking a sandwich, a snack, a dessert, and a drink for his lunch. He can have a ham, turkey, or salami sandwich; an apple, banana, or carrots for his snack; a cookie or brownie for his dessert; and apple or orange juice for his drink. How many different lunch combinations does Billy have to choose from?

There are 36 different possibilities for his lunch. 

We can use the fundamental counting principal to solve this problem. We simply need to find the number of options for each part of the meal and multiply them.

Sandwich = 3
Snack = 3
Dessert = 2
Drink = 2

3 x 3 x 2 x 2 = 36