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23 July, 18:15

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. 23 July, 18:45
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    Step-by-step explanation:

    No. Of white marble n (W) = 2

    No. Of black marble n (B) = 1

    Total no. Of marble N = 2 + 1 = 3

    Prob (1st is white) = n (W) / N = 2/3

    Prob (1st is black) = n (B) / N = 1/3
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