An urn contains 4 white and 6 red balls. Four balls are drawn at random from the urn. Find the probability distribution of the number of white balls.

An urn contains 4 white and 3 red balls.Three balls are drawn at random from the urn with replacement.Find the probability distribution of the number of red balls.

An urn contains 3 white and 6 red balls.Four balls are drawn one by one with replacement from the urn.Find the probability distribution of the number of red balls drawn.Also find mean and variance of the distribution.

An urn contains 4 white and 3 red balls. Three balls are drawn with replacement from this urn. Then, the standard deviation of the number of red balls/drawn is

There are 5 white and 4 red balls in a bag. Three balls are drawn one by one without relacement. Find the probability distribution for the number of white balls drawn.

An urn contains 4 black and 6 red balls. If two balls are drawn at random from the urn without replacement ,then the probability that both are black is

An urn contains 7 white,5 black and 3 red balls.Two balls are drawn at random.Find the probability that i.both the balls red il.one ball is red and the other is black iil.one ball is white.

An urn contains one black ball and one green ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn. What is the probability of getting at least one green ball?

An urn contains one black ball and one green ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn. What is the probability that both balls are of same colour?