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).

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

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step-by-step explanation:

a

step-by-step explanation:

its wrong