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If there are 72 games in a series and each team plays every other team twice, once at home and once away, how many teams are there?
7 years ago

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Scott
each of n teams plays n-1 teams twice
... but A playing B is the same game as B playing A

n * (n-1) * 2 * 1/2 = 72 ... n^2 - n = 72

n^2 - n - 72 = 0 ... (n - 9)(n + 8) = 0
7 years ago

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