alekth on 02 December 2010
Hm, I read the whole thing, but I don't think their explanation of probability holds much in the actual situation. The person opening the doors knows where the car is, there is absolutely no probability at work. In the end you are left to choose between two doors, and you weren't left with these two doors due to sheer chance.
It doesn't really matter how many doors, neither does your initial choice at all, so 50:50.
edit: I see the 2/3 now, pretty clever indeed
