Added new descriptions for progs
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The [Monty-Hall-Problem](http://en.wikipedia.org/wiki/Monty_Hall_problem) is an old mathematical riddle
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> Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice?
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The answer - even though it might seem strange - is **yes**, you should change.
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For the full mathematical proof you can read wikipedia, but to visualize the problem you can use this little program and test it by yourself.
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You can even automate a few hundred tests and see whats right on average.
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