Three urns, A, B, and C contain 6 red and 4 white ; 2 red and 6 white; and  1 red and 5 white balls respectively. An urn is chosen at random and a bal is drawn. If the ball drawn is found to be red, find the probability that the ball was drawn from urn A.

Three urns contain 6 red, 4 black 4 red, 6 black and 5 red, 5 black balls respectively. One of the urns is selected at random and a ball is drawn from it. If the ball drawn is red, find the probability that it is drawn from the first urn.

A bag A contains 2 white and 3 red balls another bag B contains 4 white and 5 red balls. A bag is chosen at random and a ball is drawn from it. If the ball drawn is red, what is the probability that the bag B is chosen? [CBSE '04C)

There are 6 red and 4 black balls in a bag. A ball is drawn at random. Find the probability that the ball drawn is red.

A bag contains 9 red and 12 white balls one ball is drawn at random. Find the probability that the ball drawn is red.

There are 4 red and 5 white balls in a bag. A ball is drawn at random and then again a ball is drawn from the remaining balls. Find the probability that both drawn balls are red.

Bag 4 contains 3 red and 2 white balls, and Bag B contains 2 red and 5 white balls. A bag is selected at random, a ball is drawn and put into the other bag, then a ball is drawn from the second bag. Find the probability that both balls drawn are of the same colour.

An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.

A bag contains 8 red, 3 white and 9 blue balls. If three balls are drawn at random, determine the probability that the ball is red.

A bag A contains 2 white and 3 red balls and a bag B contains 4 white and 5 red and balls. One ball is drawn at random from one of the bags and is found to be red. Find the probability that it was drawn as red.

There are 5 red and 7 white balls in one bag and 3 red and 8 white balls in second bg. If a ball is drawn at random from one the bags, find the probability that it is red.