A bag initially contains one red and two blue balls. An experiment consisting of selecting a ball at random, noting its colour and replacing it together with an additional ball of the same colour. If three such trials are made, then
(A) Probability that at least one blue ball is drawn is 0.9.
(B) Probability that exactly one blue ball is drawn is 0.2.
(C) Probability that all the drawn balls are red given that all the drawn balls are of same colour is 0.2.
(D) Probability that at least one red ball is drawn is 0.6.
