Given a parent initially purchased Brand A, the probability that this parent purchases Brand B on the second purchase is (0.75)(0.75)+(0.25)(0.20) = 0.5625 + 0.0500 = 0.6125 (0.20)(0.25)+(0.80)(0.80) = 0.0500 + 0.6400 = 0.6900 (0.20)(0.75)+(0.80)(0.20) = 0.1500 + 0.1600 = 0.3100 (0.75)(0.25)+(0.25)(0.80) = 0.1875 + 0.2000 = 0.3875 None of the above