Monty's Dilemma

Miscellaneous Forums/General Discussion/Monty's Dilemma

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In this case the original probability is 1/3 for each door. After he shows an empty door the probability drops to 0 for that one, 1/3 for your door and 2/3 for the other one.

Sorry, I don't get that part. Why doesn't the probability drop to 1/2 for your door, 1/2 for the other door and 0 for the open door?