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sysprog1 said:None of Monty's motions changes the 1/3 chance you have of having picked the prize door.
That's a good way to look at it. Your original door still has 1/3 chance of winning. That leaves 1-1/3 = 2/3 chance and only one door for the 2/3 chance. So it is best to switch to that door.sysprog1 said:If you lose when you switch, it's because you picked the prize door and switched; but whenever (2/3 chance) you don't pick the prize door, switching always wins.
ADDED: What makes your door different from the other remaining unopened door is that the rules didn't allow Monte to open your door. So we learn nothing from the fact that he didn't open your door. On the other hand, he was allowed to open the other remaining unopened door if it doesn't have the prize. So we should adjust our judgement about that door.
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