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1. An urn contains 12 white, 5 yellow, and 13 black marbles. A marble is chosen at random from the urn, and it is noted that it is not one of the black marbles. What is the sample space in view of this knowledge? What is the probability that it is yellow?

2. Two fair dice are rolled and face values are noted.

(a) What is the probability space?

(b) What is the probability that the sum of the numbers showing is 7?

(c) What is the probability that both dice show number 2?

3. In a city, 65% of people drink coffee, 50% drink tea, and 25% both. What is the probability that a person chosen at random will drink at least one of coffee or tea? Will drink neither?

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