10. Correct. The answer is false not true. There two ways for calculating this probability. First, the probability of drawing Gold or Silver in the first draw can be obtained by dividing the number of metals you are interested in and the total number of minerals in the set. So, you have 2/4 = 1/2 (you should have in mind that we are using the classical approach). Secondly, there is an axiomatic way for calculating the probability of drawing Gold or Silver. We can express this likelihood using sets and the probability function 'P': P (Au1 U Ag). Since the events of drawing Gold or Silver are mutually exclusive, then P (Au1 U Ag) = P(Au1) + P(Ag). Therefore: 1/4 + 1/4 = 1/2 .