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The formula x^2-x=N can used to determine the total number of games played, N, in a league of X teams in which all teams play each other twice. Serena referees for a soccer league in which all teams play each other twice and a total of 90 games is played. How many teams are in the league?
Answer 156669 by jringelman(2) on 2009-08-17 20:09:25 (Show Source):