re: Let's discuss the Monty Hall problem (probabilities, odds)

quote:

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Tell me where this is incorrect. 3 options, you choose door 1 each time, you switch every time: 1. Car is behind door 1, you switch you lose 2. Car is behind door 2, you switch you win 3. Car is behind door 3, you switch you win

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Because the way the problem was stated, you picked door #1 and door #3 was opened, so the car is not behind door #3, leaving only the first two sçenarios, which shows the odds to be 50%.
If the problem is worded that you choose a door and the host opens a door to reveal a goat, it's a different scenario. That's not what the problems states as given in the OP.