A bag contains 27 balls of which some are White and others are Red. A ball is choosed at random. The probability of getting a Red ball is `2/3`. Find the number of White balls.

A bag contains 4 red, 6 white and 5 black balls. 2 balls are drawn at random. The probability of getting one red and one white ball is

A bag has balls of which x are, 2x are white, and 3x are blue. A ball is selected at random. What is the probability that the balls drawn is (i) not blue (ii) white

A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected at random the probability that it is either red or black is

A bag has 20 balls of which x are white. One ball is drawn at random from the bag and the probability of it being white is y. after replacing this ball, 10 more white balls are added to the bag and the probability of now drawing a white ball is 2y. Find x.

An urn contains 9 balls two of which are red, three blue and four black. Three balls are drawn at random. The probability that they are of same colour is

A bag contains 5 red and 3 blue balls. If 3 balls are drawn at random without replacement the probability of getting exactly one red ball is

A bag has white, black, and red balls. A ball is drawn at random from the bag. The probability of getting a white ball is 3/(10) and that of a black ball is 2/5 . Find the probability of getting a red ball. If the bag has 20 black balls, find the total number of balls in the bag.

An urn contains nine balls of which three are red four are blue and two are green three balls are drawn at random the probability that the three balls different colours is