At pizza hut there are 10 different toppings you can get on your pizza. How many different pizzas are there with 3 toppings? With 7 toppings? If a pizza can have anywhere from 0 to 10 toppings, how many different pizzas are there?
For each of the 10 toppings, you can choose to have it or don't have it, 2 options.
2^10 = 1024