解：（1）C(4,2)/C(5,2)*C(3,2)/C(5,2)=6/10*3/10=9/50(2)1-C(4,1)/C(5,2)*C(3,2)/C(5,2)-C(4,2)/C(5,2)*C(2,1)*C(3,1)/C(5,2)=1-3/25-9/25=8/25
