1、再赛2局比赛结束,即甲连胜2场或乙连胜2场：
P = 0.6*0.6 + 0.4*0.4 = 0.52
2、甲获胜的概率,即连胜2场或后3场胜2场：
P = 0.6*0.6 + 0.6*0.4*0.6 + 0.4*0.6*0.6 = 0.36 + 0.288 = 0.648