Mathematical problem of probability based on a usable television contest of the 70s and 80s led by a certain Monty Hall : A contestant must choose to open a door between three to appropriate what is inside. Behind one is a car. Behind the other two a goat. Once the contestant has chosen one, the presenter opens another by appearing a goat. Should the contestant change his choice to have more evidence of getting the car right? . I don't think I'm a mathematician. But mathematicians say yes.
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