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| rev | Admin | (Created page with "'''Solution: B''' There are 500 coins in each box with one fake, so the probability that he finds at least one fake when he randomly selects 2 coins from a single box equals 1-(499/500)*(498/499) = 0.004. Then the number of fakes that he finds after testing 250 boxes is a binomial distribution with parameters <math>n=250, p=0.004 </math> and therefore the probability that he finds at least one fake is 1 minus the probability of not finding any fakes: 1-(1-0.004)<sup>2...") | Jun 26'24 at 9:51 | +493 |