Problem 8. An urn contains 20 red balls and 50 blue balls. Two are chosen at random, one after the other, without replacement. (Give exact answers.) (a) What is the probability that the first one is blue and the second one is also blue. Justify your answer. (b) What is the probability that the second one is blue (the first one can be blue or red.) Justify your answer.

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A: n1=80, x1=64 n2=60, x2=39 X: people got sick 1: Ate fish 2: Did not eat fish

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