1. This game is fair. Because the probability of A winning and the probability of B winning are both half.

Three fifths. Male 1 (male 2, male 3, female 1, female 2), male 2 (male 3, female 1, female 2), male 3 (female 1, female 2), female 1 (female 2). It is not easy to draw a tree. The empty number is the corresponding branch in front.