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Jane has a pizza shop. She has 1 type of crust, 1 type of sauce and 6 toppings. How many 2 topping pizzas can she make. Note the same topping can't be used for 1 pizza

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1*1*C(6,2) = 15

extra credit: why did I multiply by 1 -- twice!?

also, proofread before posting. I assume you meant the same topping can't be used twice for 1 pizza.

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