bonsoir,
1 ) proba boule B = 60/210 = 2 / 7
2 ) proba V = 0.2
V / 210 = 0.2 donc V = 42
3 ) 210 - ( 60 + 42) = 108
108 R
108/210 ≅ 0.51
18/35 = ≅ 0.51
