An urn contains 4 balls. Two balls are drawn at random from the urn (without replacement) and are found to be white. What is the probability that all the four balls in the urn are white ?

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 8 white and 4 red balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are white ?

An urn contains 10 white and 5 black balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are white?

An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are black ?

An urn contains 10 black and 5 white balls. Two balls are drawn from the nm one after the other without replacement.What is the probability that both drawn balls are black?

A bag contains 4 balls.Two balls are drawn at random,and are found to be white.What is the probability that all balls are white?

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 10 black and 5 white balls. Two balls are drawn from the run one after the other without replacement. What is the probability that first ball is black and second ball is black and second ball is white ?

An urn contains 3 white, 4 red and 5 black balls. Two balls re drawn one by one without replacement. What is the probability that at least one ball is black?

An urn contains 3 white,4 red and 5 black balls.Two balls are drawn one by one without replacement.What is the probability that at least one ball is black?