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Answer to Question #489 in Statistics and Probability for Silvia

Question #489
5 people left their hats in the wardrobe. Then everybody took a hat randomly. What is the probability that everyone took not his hat?
1
Expert's answer
2010-07-23T10:32:40-0400
Answer: 1/2! – 1/3! + 1/4! – 1/5! = 11/30.

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