Bonsoir,
total des billets gagnants :
4+12+36+68 = 120
Il y a 180 billets.
a)
12/180 = 1/15
b)
36 + 12 = 48
48/180 = 24/90 = 12/45 = 4/15
c)
180 - 120 = 60
60/180 = 6/18 = 1/3
