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 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.

A bag contain n white and n black balls, all of equal size. Balls are drawn at random. Find the probability that there are both white and black balls in the draw and that the number of white balls is greater than that of black balls by 1.

One bag contains 5 white and 3 black balls.Another bag contains 4 white and 6 black balls, If one ball is drawn from each bag, find the probability that (i)both are white (ii)both are black(iii)one white and one black.

One bag contains 5 white and 3 black balls, Another bag contains 4 white and 6 black balls. If one ball is drawn from each bag, find the probability that (i) both are white (ii) both are black (iii) one white and one black.

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