(a) P = P(G)*P(A) = 0.2*0.6 = 0.12. (b) P = P(G) + P(A) - P(G)*P(A) = 0.2 + 0.6 - 0.2*0.6 = 0.68. (c) P = (P(G) - P(G)*P(A)) + (P(A) - P(G)*P(A)) = (0.2-0.12) + (0.6-0.12) = 0.56. (d) P = the complement to the probability of the n.(b) = 1 - 0.68 = 0.32.