Wednesday, September 26, 2007

Round Robin Puzzle

I could be wrong, but I don't think I've ever had a round robin tournament here before, so:

A set of soccer matches is to be organized in a "round-robin" fashion, i.e., every participating team plays a match against every other team once and only once.

If 66 matches are totally played, how many teams participated?


  1. Yup. 12. took about 20 seconds. formula is roughly y=.5x^2-.5x where y=number of games, and x=number of teams

  2. Who am I to argue? :-)

    12 is the answer.


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