If only one gate can be chosen at the beginning, the probability is 1/3. There is no doubt
that if you are asked to choose two doors at the beginning, the probability is 2/3. There should also be no controversy.
The rules of the game are to let you choose 2 doors by changing.
As for which of these two doors does not have a car, the host has already ruled out one for you, so you don't have to worry about it anymore.
As for whether the host can rule out the right or not, it is the core of everyone's controversy. If the host knows in advance that one row is accurate, your chance of winning the lottery will be locked in 2/3, but if the host does not know, it is also a random row, then you The probability of winning the lottery is reduced from 2/3 to (2/3*1/2=1/3), which is the same as the probability of choosing a car before, that is, you can change it or not.
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