[" 10.A bag contains "4" red and "6" black balls.A ball is drawn at random from the bag,its colour is "],[" A bag contains "4" red and "6" black balls.A ball is drawn at random from the bag,its colour is "],[" observed and this ball along with two additional balls of the same colour are returned to the bag."],[" If now a ball is drawn at random from the bag,the probability that this drawn ball is red,is: "],[[" (1) "(3)/(4)," (2) "(3)/(10)," (2) "(3)/(10)]]