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I'm with the Morgan et al. 91 train of thought on this one. If the quizmaster opens door number three with nothing behind it you've already made a right choice, so your chances aren't 1/3 or 2/3 (those were your chance before any door was open) your chances are now 1/2.
If when all doors are closed the quizmaster says i'll open a door if you switch. then by switching your odds go to 2/3 but If you already picked door 1 and the host already opened door 3 odds are 1/2 .
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