# solution

Urn I contains six black and nine white balls; urn II contains five black, twelve white, and nine red balls; and urn III contains eleven black, six white, and twelve red balls. Roll a fair die. If the die is a one, three, or five, randomly select a ball from urn I. If the die is a two or four, randomly select a ball from urn II. If the die is a six, randomly select a ball from urn III.

(a) Determine the probability that the ball is black by drawing a tree diagram.

(b) Determine the probability that the ball is black using the Rule of Total Probability.

(c) If a randomly chosen ball is black, what is the probability that the ball came from urn I?

(d) If a randomly chosen ball is red, what is the probability that the ball came from urn I? urn II? urn III?

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