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A box contains 4 red markers and 2 blue markers a marker is selected at random and it’s color is noted. If it is red it is replaced; otherwise it is not. a second marker is selected and it’s color is noted. If the second is blue, find the probability that the first was blue?

 Feb 26, 2020
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P[first was blue | second was blue]=P[second was blue | first was blue]P[first was blue]P[second was blue]=15131513+1323=1151345=313

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 Feb 26, 2020

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