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Mathematics 20 Online
OpenStudy (anonymous):

A bag contains red and blue marbles totaling between 50 and 100 in number. If two marbles are drawn at random, the chances of them both being red are 25%. One third of the marbles are picked from the bag at random, and thrown away. If one marble is now drawn at random from the bag, what is the probablitity of it begin blue (in %)?

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