10 teams played a round-robin baseball tournament (meaning that every team played exactly 9 games: one game against each of the other teams; there are no ties in baseball). No two teams won exactly the same number of games. Prove that there is a team that won exactly 6 games.
Every team play 9 games, no two team won exactly the same number of games, so Team 1- 9 wins Team 2- 8 wins And so on, last team (team 9) wins 0 So one team must won 6 times. (Because no two team won exactly the same number )
