Box B1 contains 3 white and 5 red , and box B2 contains 6 white and 4 red . A box is selected based on the outcome of tossing a coin with P(Head) = 2/3. The box B1 is selected if head appears and B2 otherwise. A ball is then drawn at random from the selected box. The probability that it is a red ball is
(a) 41/60
(b) 49/60
(c) 9/18
(d) of the above
