**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 (Au_{1} U
Ag). Since the events of drawing Gold or Silver are mutually exclusive, then P
(Au_{1} U Ag) = P(Au_{1}) + P(Ag).
Therefore: 1/4 + 1/4 = 1/2 .