A friend of mine watched the movie, 21, and called me in about a three door problem in the movie. The problem is a Hollywood translation of the much discussed Monty Hall problem. I remember vaguely discussing a quantum state equivalent of this problem in my lab once, but couldn’t immediately connect it with Monty Hall. Makes for some nice counterintuitive fun. Just as always, Wikipedia has it covered. Read it, if you already haven’t.

Update: Yet another angle to the Monty Hall problem.

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