3局2勝中,甲勝的概率是：（前兩局剛好1勝1負(fù)）0.6*0.4*0.6+0.4*0.6*0.6
和（前兩局都勝）0.6*0.6之和
=0.6*0.4*0.6+0.4*0.6*0.6+0.6*0.6=0.648
5局3勝中,甲勝的概率是：（前三局剛好2勝1負(fù),且第四局勝）3*0.6*0.6*0.4*0.6
和（前四局剛好2勝2負(fù),且第五局勝）(C4,2)*0.6*0.6*0.4*0.4
以及（前三局都勝）0.6*0.6*0.6之和
=3*0.6*0.6*0.4*0.6+6*0.6*0.6*0.4*0.4+0.6*0.6*0.6=0.8208
所以在5局3勝制中,甲的獲勝概率大.
順便說一下,打得局?jǐn)?shù)越多,甲的獲勝概率越大,
并且當(dāng)打得局?jǐn)?shù)接近于無窮多次后,甲的獲勝概率接近于100%