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probability
My 5th grader thought this was extremely thought provoking.
If 20 people put there hats into a bag, close their eyes and each take out one hat. What is the probability that exactly 19 of them will get their own hat back?
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The probability that exactly 19 will get thier own hat is zero. Because if 19 get theri own then the 20th would get his/her own as well.
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