An urn contains 4 blue marbles and 3 green marbles. One marble is​ removed, its color​ noted, and not replaced. A second marble is removed and its color is noted. ​(a) What is the probability that both marbles are blue​? green​? ​(b) What is the probability that exactly one marble is blue​? (a) ​Pr(BB​)=nothing ​(Type an integer or a simp

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