Conditional probability

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

Oct 12th, 2015

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= 2/6

1/3

Please let me know if you need any clarification. I'm always happy to answer your questions.Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 12th, 2015

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