# solution

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