# Question

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 ith ball selected is white, and let it equal 0 otherwise. Give the joint probability mass function of

(a) X1, X2;

(b) X1, X2, X3.

(a) X1, X2;

(b) X1, X2, X3.

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