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【简答题】
某篮球队与其他6支篮球队依次进行6场比赛，每场均决出胜负，设这支篮球队与其他篮球队比赛中获胜的事件是独立的，并且获胜的概率均为 1 3 ． （1）求这支篮球队首次获胜前已经负了两场的概率； （2）求这支篮球队在6场比赛中恰好获胜3场的概率； （3）求这支篮球队在6场比赛中获胜场数的期望．
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