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by Swenrekcah 2082 days ago
Because it isn't different really. It is always a goat door that is opened, so you don't gain any information about your door by the opening of the goat door.

I'm thinking of a number between 1 and 10, guess it. If I now tell you a number I promise is not the one I was thinking and not your number, you have no more information about if you were correct.