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18 August, 08:23

Question 10 an urn contains two white marbles and one black marble. a marble is drawn from the urn without replacement and put aside without my seeing it. then a second marble is drawn, and it is white. what is the probability that the unknown removed marble is white, and what is the probability that it is black?

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  1. 18 August, 08:33
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    2 whites and 1 black = 3 marbles

    P (white + white) = (2/3) (1/2) = 2/6 = 1/3

    P (white + black) = (2/3) (1/2) = 2/6 = 1/3

    Ans: (a) 1/3 (b) 1/3
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