13. In the National Leage there are 15 teams. These teams are split into 3 divisions as follows: 5 teams in th
East Division, 5 teams in the Central Division, and 5 teams in the West Division. Four of these teams
participate in the playoffs. The division winner from each division goes to the playoffs; in addition, the
remaining team with the best record participates in the playoffs as the wild card team. How many differe
collections of four teams from the National League could go to the playoffs?