31. An urn initially contains ???? black and ???? white balls. At each stage we add ????...
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31. An urn initially contains ???? black and ???? white balls. At each stage we add ????
black balls and then withdraw, at random, ???? from the ???? + ???? + ????. Show that
????[number of white balls after stage ????] =
(???? + ????)/(???? + ???? + ????) ????
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