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For 7 soccer ball teams, each of them has to play with all the other teams. However, to decide which team wins, every two teams have to play 3 rounds and the team that win for the most times will ultimately win. How many rounds of game do all teams have to play in total?
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· 相关考点
6.3.5 组合 2.5.9 握手问题
6.3.5 组合
2.5.9 握手问题
以上解析由 考满分老师提供。