Table tennis teams from nine countries, including three Asian countries, were divided into three groups for the preliminary round (three teams in each group).

All grouping results are equally possible. The nine teams were divided into three groups on average, and the different scores were: 280 (species). Each of the three teams has an Asian team, which can be regarded as two of the other six teams combined with 1 Asian team, the other four teams combined with the second Asian team, and the last two teams combined with the second and third Asian teams, all with different scores of 90. So the probability that each of these three groups has an Asian team is

9/28