Actually, 20 teams each play 19 others ... twice 20 x 19 x 2 = 760. team.games ... but there are two teams in each game so divide this by 2. To get 380 games.
sorry me miss typing should have read 19x2 - thanks acas - where on earth does Maty get 380 games?? - hey a season wouldn't be over in a season!! well if we work on a game a week, 52 weeks in a year . . . . etc etc