P( draw in 1 round )=366=61P( win in 1 round )=21(1−61)=125P( loss in 1 round )=125P(X2>Y2)=P(10,0)+P(7,2)=125×125+125×61×2=14445=165P(X2=Y2)=P(5,5)+P(4,4)=125×125×2+61×61=7225+2=83P(X3=Y3)=P(6,6)+P(7,7)=6×6×61+125×61×125×6=4322+43275=43277P(X3>Y3)=21(1−43277)=864355