There are N people in a room, each wearing a different hat. They all take their hats off,put them together and then each randomly picks one up. What is the probability of no persongetting their own hat back (denote this event by A)? What does this probability become as Nāā?
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I solved it using permutations,but I'd like to solve it using probability. Any idea? ā Amy_Farrah_Fowler Oct 28 '20 at 14:33
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2Familiar with derangements? IMV permutations and probability are quite hard to separate. ā drhab Oct 28 '20 at 14:43