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Because Monty can not open the player's curtain at this stage the probability of the player's curtain reveals the car stays at 1/3. The probability an unchosen curtain reveales the car remains at 2/3, however it is now all on one curtain. So after a goat is revelead the probability the player's curtain has the car is 1/3 and the probability the other unopened curtain has the car is 2/3, making switching a wise choise.
Don't agree with this logic. Since a curtain was revealed that does not have a car, the two remaining curtains have a 1/2 chance of having the car. My suggestion is being offered another chance makes sense if the original choice was good, assuming the host would rather not give away the car. That's a big assumption.
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