# Sampling without replacement. Probability mass function

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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.

See the attached file.

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#### Solution Summary

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.

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