>Dan
>
>When you choose the first time: you have a 33% chance of getting the car whichever door you choose. But it doesn't matter, because Monty changes the test and invites you to try again.
>
>When you choose the second time: you have a 50% chance of getting the car whichever door you choose.
>
>Only the 50% matters. Your previous choice has no impact on this whatsoever. One door has a car and one a goat no matter what you did the first time.
>
>
>Regards
>
>JR

Try this link:

http://www.shodor.org/interactivate/activities/monty3/#

Try staying with your original choice for a while and keep an eye on the win percentage. Then, try switching to the other door after your original choice and watch the percentage again. The results are interesting (and prove Dan correct).