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Your friend randomly selects two movies from your collection to borrow. Your collection includes 9 comedies, 5 dramas, 3 mysteries, 1 musical, and 2 horror movies. What is the probability that both movies are comedies?
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Initially there are 20 movies to choose from. On the first selection the probability of choosing a comedy is 9/20. If a comedy was selected on the first selection, there will be 8 comedies in a total of 19 movies; so the probability of choosing another comedy is 8/19. Therefore the probability that both movies are comedies is given by: \[P(2\ comedies)=\frac{9\times8}{20\times19}=you\ can\ calculate\]
72/380?
You are correct so far, but you need to simplify the fraction by dividing the numerator and the denominator by 4.
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