BEN IS BACK!!! 1
Ben has an urn containing only red and blue marbles. He selects a number of marbles from the urn at random and without replacement. He needs to draw at least marbles in order to be sure that he has at least two red marbles. In contrast, he needs three times as much in order to be sure that he has at least two blue marbles. How many marbles are there in the urn?
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