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I'm having trouble understanding a question, which looks deceptively simple. May be it is. I would like to know how any of you would tackle the following problem?

There are N men wearing identical hats in a room. They all take off their hats and place it in the center of the room and then each one of them picks up a hat. What's the probability none of them will end up with the hat he was initially wearing?

Thank you in advance,

Manisha

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# Permutation and combination problem

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