If from each of the three boxes containing 3 white and 1 black, 2 white and 2 black, 1 white and 3 black balls, one ball is drawn at random, then the probability that 2 white and 1 black balls will be drawn, is

A bag contains 5 white and 7 black balls,3 balls are drawn at random.Find the probability that (i)all are white,(ii)one white and two black.

A bag contains 2 red balls and 4 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is red?

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 7 red and 4 black balls, 3 balls drawn at random. Find the probability that (i) all are red (ii) one red and 2 black.

There are 3 bags which are known to contain 2 white and 3 black, 4 white and 1 black, and 3 white and 7 black ball, respectively. A ball is drawn at random from one of the bags and found to the black ball. Then the probability that it was drawn from the bag containing the most black ball is a. 7//15 b. 5//19 c. 3//4 d. none of these