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7 kids play poker games together, and every two kids play five rounds to determine who wins. How many rounds do they need to play so that every kid plays with all the other kids?
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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。
