I agree with HW3.1.b Anthony O'Brien_ECE302Fall2008sanghavi.
If you look at the probibility of how your friend was kicked off:
P[friend out | y=C , f=G] = 2/3
p[friend out | y=G , f=G] = 1/3
p[friend out | y=G , f=C] = 0
So if your friend is kicked off then it is more likely that he was kicked off becaus you picked a car than you both picked a goat.
