Slim Shady
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Probability that a group of 7 randomly choosen pizzas includes 4 specific pizzas when there are 4 kinds of pizzas to choose from.
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A nice way to show this is to consider using ‘dividers’ that separate the $7$ friends into their pizza choices. For example $oo|ooo|o|o$ would say that two have chosen pizza A, three pizza B, one ...

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