1)a) P(B)=300/1200+500/1200=800/1200=8/12=4/6=2/3
b)P(F)=500/1200=5/12
c)P(FnB)=300/1200=3/12=1/4
d)Non car il y as des femmes brunes
e)P(HnB)+P(B)-P(FnB)=500/1200+800/1200-300/1200=1000/1200=5/6
2)Ph(B)=P(BnH)/P(H)=(500/1200)/(700/1200)=5/12*12/7=5/7.