Two similar boxes `B_i (i=1,2)` contain `(i+1)` red and `(5-i-1)` black balls. One box is chosen at random and two balls are drawn randomly. What is the probability that both the balls are of different colours?

A bag contains 8 red and 7 black balls. Two balls are drawn at random. The probability that both the balls are of the same colour is :

A bag contains 8 red and 7 black balls. Two balls are drawn at random. The probability that both the balls are of the same colour is :

A bag contains 8 red and 7 black balls. Two balls are drawn at random. The probability that both the balls are of the same colour is :

BOX A contains 6 white balls and 4 red balls.BOX B contains 5 white balls and 5 red balls.One of the boxes is chosen at random and two balls are drawn from it . Find the probability that both balls are red balls .

A box contains 2 red, 3 blue and 4 black balls. Three balls are drawn at random. What is the probability that two balls are of the same colour and the third of a different colour.

A box contains 5 red 4 green & 6 black balls .If 3 balls are drawn at random. Find the probability that all balls are red colour .

There are two identical boxes containing respectively 5 white and 3 red balls, 4 white and 6 red balls. A box is chosen at random and a ball is drawn from it (i) find the probability that the ball is white (ii) if the ball is white, what is the probability that it from the first box?

There are two identical boxes containing respectively. 6 black and 4 red balls, 2 black and 2 red balls. An urns is chosen at random and a ball is drawn from it (i)find the probability that the ball is black,(ii)if the ball is black,what is the probability that it is from the first urn?