Permutation - A selection of a group of items or events from a set with regard to order. (Order is important.) Combination - A selection of a group of items or events from a set without regard to order. (Order doesn't matter.)
Students in the Spanish Club are selling two-topping pizzas. Buyers may choose their two toppings from the following list:
pepperoni sausage black olives green pepper
How many different combinations are possible?
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