Combinatorics

Combinatorics is a way of figuring out how many different possibilities there can be when choosing something. It's like when you are getting a new pet, and you can choose between cats and dogs. Combinatorics can help you figure out how many different choices you have when you're combining cats and dogs. For example, you could have one cat and one dog, two cats, one cat and two dogs, two dogs and one cat, one cat, or two dogs. So combinatorics can help you figure out the total number of combinations that you can have.