You and your friends are going to order pizza. You have three choices of size(small, medium, large), three choices of crust(thin, hand tossed, pan) and seven choices of topping (extra cheese, sausage, pepperoni, ham, onions, green peppers and mushrooms). If you are going ti choose two toppings, how many different kinds of pizza do you have to choose from? You may choose double of one topping if you wish).
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