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(1) Suppose we randomly choose three pens out of 3 black pens and 3 red pens. Let X be the number of red pens. Find

(1) Suppose we randomly choose three pens out of 3 black pens and 3 red pens. Let X be the number of red pens. Find (a) the probability mass function p(), (b) the cumulative distribution function F(a), (c) EX, (d) EX2, (e) Var (X)

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