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problem about tournament

Source: China south east mathematical olympiad 2004 day2 problem 7

June 29, 2013
floor functionceiling functionpigeonhole principleset theorycombinatorics unsolvedcombinatorics

Problem Statement

A tournament is held among nn teams, following such rules: a) every team plays all others once at home and once away.(i.e. double round-robin schedule) b) each team may participate in several away games in a week(from Sunday to Saturday). c) there is no away game arrangement for a team, if it has a home game in the same week. If the tournament finishes in 4 weeks, determine the maximum value of nn.