Question

Suppose that each of n men at a party throws his hat into the center of the room.the hats are first mixed up, and then each man randomly selects a hat. Show that theprobability that none of the men selects his own hat is
1/2! - 1/3! + 1/4! - +...(-1)^n/n!​

Answer 1

Answer:

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Step-by-step explanation:

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