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 combinations of pizza toppings

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T O P I C    R E V I E W
westworld Posted - 01/27/2012 : 22:25:06
A vegetarian pizza restaurant has 10 toppings from which to choose. The toppings are onions, mushrooms, tomatoes, green peppers, black olives, hot peppers, jalapenos, spinach, pineapples, and green olives. It is also possible to order a plain pizza, which just has sauce and cheese. The order in which toppings are placed on the pizza does not matter. Also, suppose the pizza restaurant will not sell a "double-topping" pizza -- that is, you can order two different toppings at the same time but not "double mushrooms." How many different two-topping pizzas are possible?
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Ultraglide Posted - 02/02/2012 : 18:17:38
How many ways can you choose the first topping? Now how many choices are left for the second topping? You also have to remember the basic sauce and cheese. (Remember onions and mushrooms are the same as mushrooms and onions.)

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