bin 1 contains nine red balls and three blue balls. bin 2 contains five blue balls and three red balls. One ball is drawn from each urn and is discarded. Then all the remaining balls are put into bin 3. now a ball is drawn from bin 3. what is the probability that it is a blue ball from bin 3. Given that a blue ball is drawn from bin 3 what is the probability that two blue balls were previously discarded

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