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3. Suppose k balls are drawn at random, without replacement, from an urn containing n red and m green balls. Let Yj 1 , if

3. Suppose k balls are drawn at random, without replacement, from an urn containing n red and m green balls. Let Yj 1 , if red ball j is selected otherwise, j = 1, 2, ..., n, and Y = Y1+ . .. + Yn = # of red balls in the sample. Find Var[ Y]

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