This is a classic:
$N$ people attend a party and deposit their ($N$) coats with the coat keeper.
At the end of the party, everyone is drunk (even the coat keeper). The coat keeper hands out a random coat to anyone who comes to claim a coat. Since the owner of the coats are drunk too, no one notices.
What is the expected number of people that get their correct coat back?
$N$ people attend a party and deposit their ($N$) coats with the coat keeper.
At the end of the party, everyone is drunk (even the coat keeper). The coat keeper hands out a random coat to anyone who comes to claim a coat. Since the owner of the coats are drunk too, no one notices.
What is the expected number of people that get their correct coat back?
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