An urncontains 5 red and 2 black balls. Two balls are randomly selected. Let x represent the number of black balls. What are the possible valuesof X ? Is X a random variable ?

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is red ?

An urn contains 5 red and 5 black balls. A ball is drawn at random, its colour is noted and is returned to the urn. Moreover, 2 additional balls of the colour drawn are put in the urn and then a balls is drawn at random. What is the probability that the second ball is red ?

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

An urn contains m white and n black balls. A ball is drawn at random and is put back into the urn along with k balls of the same colour as that of the ball drawn. a ball is again drawn at random. Show that the probability of drawing a white ball now does not depend on k.

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is not red ?

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals

A bag contaings 3 white 4 black 2 red balls if 2 balls are drawn at random then the probability that both the balls are white is

A bag contains 3 red balls and 5 black balls . A ball is drawn at random from the bas. What is the probability that the ball drawn is (i) red ? (ii) not red ?

A bag contains 3 white , 4 black , 2 red balls . If 2 balls are drawn at random , then the probability that both the balls are white is :