Quote:
It feels like those scenarios are overlooking something...

Ninti's scenario doesn't overlook anything. Although it posits a scenario where the car is behind door C, you could replace all of the A B and C variables with nonspecific terms and it still works. Like so:

If you choose the first goat, he reveals the second goat, and the correct choice is to switch.
If you choose the second goat, he reveals the first goat, and the correct choice is to switch.
If you choose the car, he reveals one of the goats, and the correct choice is not to switch.
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Tony Fabris