Suppose that 3 balls are chosen without replacementfrom an

Chapter 6, Problem 6.2

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Suppose that 3 balls are chosen without replacementfrom an urn consisting of 5 white and 8 redballs. Let Xi equal 1 if the ith ball selected is white,and let it equal 0 otherwise. Give the joint probabilitymass function of(a) X1,X2;(b) X1,X2,X3.

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