Suppose that 3 balls are chosen without replacement from an urn consisting of 5 white and 8 red balls. Let Xi equal 1 if the
i-th ball selected is white, and let it equal 0 otherwise. Give the joint probability mass function of
(a) X1, X2.
(b) X1, X2, X3.
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In this solution, the joint probability mass function of a set of random variables is found when sampling without replacement from an urn consisting of 5 white and 8 red balls.