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 ?

A bag contains 5 balls. Two balls are drawn and are found to be white. What is the probability that all the balls are white?

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 some white and some black balls, all combinations being equally likely. The total number of balls in the bag is 12. Four balls are drawn at random from the bag at random without replacement and all of them are found to be Black, then the probability that the bag contains 1 white and 9 black balls is

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.

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?

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?

A bag contains 3 green balls and 7 white balls. Two balls are drawn at random without replacement. If the second ball drawn is green, what is the probability that the first ball drawn is also green ?

Box A has 3 white and 2 red balls, box B has 2 white and 4 red balls. If two balls are selected at random without replacements from the box A and 2 more are selected at random from B, the probability that all the four balls are white is

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 are drawn one by one without replacement. What is the probability that at least one ball is black?