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OpenStudy (anonymous):
Seven people came to an evening spades party. Since only four people can play spades at any one time, they decide to play as many games as it takes to use every possible foursome once. How many games would have to be played? Could these games be played in one evening? I have no idea how to solve it, but I do know it has something to do with this formula: nCr (combinations) and notice it says "once" in the problem...?
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