there are , in a certain league , 20 teams , and each team face another team for a total of 10 times . how many games are played in the season ?
n0 = 20.0
n1 = 10.0
t0 = n0 / 2.0
t1 = n0 - 1.0
t2 = t1 * n1
answer = t0 * t2
print(answer)