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Posted by Denis Borris on 22/9/2009, 2:02 pm, in reply to "Re: My favorite probability puzzle of all time."
OK; rested and coffeed up; let's see how I can screw this up again!
Things will go same way as previouly described in ending with a 50% chance.
EXCEPT: when Alice makes her 1st pick, she does NOT open door.
Then, if she gets car or goat on 2nd pick, she switches her 1st pick to
the other door left, increasing her chances (as in Monty Hall's original).
The advantage of knowing car not behind a certain door (the plan with Bob)
comes in as it did in the 50% scenario.
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