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Suppose four people write their names on slips of paper; the slips of paper are randomly shued and then each person gets back one slip of paper; all possibilities of who gets what slip are equally likely. let x denote the number of people who get back the slip with their own name (i.e. the number of matches).

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2 votes
x=1/4. its just a probability
User Coffeeyesplease
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