At Lamppost Pizza there are four pizza toppings: pepperoni, sausage, mushrooms, and anchovies. When you order a pizza you can have as few or as many toppings you want from the above list. You can also choose to have none of the above. How many different kinds of pizza could you order?
Please help immediately!!! :(
There are 2^n subsets of a set with elements.
Consider that you have two choices for each topping: yes or no