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Monty hall problem 3 doors - there is a car in one and 2 nothing. You choose one. Host opens another one where nothing. If you stay with your choice, than you have less possibility to win. If you choose another you have bigger possibility to win.

It's seems that I have mistake in my solution, probability should be 0,33 and 0,67 - and I have 0,38 and 0,62 somehow.