A bag contains 6 red, 5 black and 4 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is :
(i) white (ii) red (iii) not black (iv) red or white.

Answer

(i)`(4)/(15)`(ii)`(2)/(5)`(iii)`(2)/(3)`(iv)`(2)/(3)`