An urn contains 6 white and 4 black balls. A fair die is rolled and that number of balls we chosen from the urn. Find the probability that the balls selected are white.

A bag contains 6 red and 4 green balls. A fair dice is rolled and a number of balls equal to that appearing on the dice is chosen from the urn at random. The probability that all the balls selected are red is

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 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 ?

A bag contains 8 red,6 white and 4 black balls.A ball is drawn at random from the bag. Find the probability that the drawn ball is (i) red or white (ii) not black (iii) neither white nor black.

An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. Find the probability that the ball drawn is (i) red (ii) white (iii) red or white (iv) white or black (v) not white

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

Two urns respectively contain 3 white, 7 red, 15 black balls and 10 white, 6 red, 9 black balls. One ball is taken from each urn. Find the probability that both be of the same colour.