There are three doors, the prize is behind one of them. You pick one at random, your chance of having chosen correctly is 1 in 3. One is eliminated because it is a known losing door, and it *can not* be the one you picked, nor can it be the one with the prize behind it. They aren’t removing doors at random, they’re removing the door that can’t possibly win. The door you picked might be the winner, but there is a 2 in 3 chance that it wasn’t, and was only kept in the game because it was the one you randomly chose. So there is a 2 in 3 chance that the door you didn’t pick *and* wasn’t removed is the winner.
But you’re going to feel way worse if you switched and the door you chose originally was the winner, so there’s that.
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