Question

! Use: n to solve the combination. Ck = k! (n-k)! = ) A pizza restaurant has hamburger, pepperoni, Canadian bacon, and sausage. How many ways can a three-topping meat pizza be made?
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Answer 1

There are 4 choices of meats from which you take 3, so there are

4! / (3! (4 - 3)!) = 4! / (3! 1!) = 4!/3! = 4

possible choices of 3-meat combos.