Suppose you are in a game and you have the right to choose one of the three doors. Behind one of the doors is a carriage and behind the others there are goats. One of the doors, let's say you choose 1st and the game who knows what's behind the doors, let's say one of the other doors, with the goat behind it, 3rd. Then you will have the right to change your choice. Is changing your choice to your advantage or disadvantage? To find out, play the game and check the statistics.