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Problem 2. (15 pts) A fair die is tossed 20 times in succession. Let Y be the total number of sixes that occur, and let X be the number of sixes occurring in the first 5 tosses. Determine the conditional probability mass function P(X r|Y ).

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Wes i -- Number ot tis tes ossed ucce tsie 0 x-no.of enes occurviv 角fat 5tstes

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