Four balls are to be drawn without replacement from a box containing 8 red and 4 white balls. If x denotes the number of red balls drawn. Find the probability distribution of x.

A box B_(1) contains 1 white ball, 3 red balls, and 2 black balls. An- other box B_(2) contains 2 white balls, 3 red balls and 4 black balls. A third box B_(3) contains 3 white balls, 4 red balls, and 5 black balls. If 2 balls are drawn (without replecement) from a randomly selected box and one of the balls is white and the other ball is red the probability that these 2 balls are drawn from box B_(2) is

Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that (i) both balls are red. (ii) first ball is black and second is red. (iii) one of them is black and other is red.

A bag contains 5 red and 3 blue balls. If 3 balls are drawn at random without replacement the probability of getting exactly one red ball is

A bag has white, black, and red balls. A ball is drawn at random from the bag. The probability of getting a white ball is 3/(10) and that of a black ball is 2/5 . Find the probability of getting a red ball. If the bag has 20 black balls, find the total number of balls in the bag.

A box consits of 4 rec. 5 black and 6 white balls. One ball is drawn out at random, find the probability that the ball drawn is black.

There are two boxes . One box contains 3 white balls and 2 black balls . The other box contains 7 yellow balls and 3 black balls . If a box is selected at random and from it , a ball is drawn , the probability that the ball is black is :

A bag contains 2 white and 1 red balls. One ball is drawn at random and then put back in the box after noting its colour. The process is repeated again. If X denotes the number of red balls recorded in the two draws, describe X.

A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected at random the probability that it is either red or black is

Six balls are drawn successively from an urn containing 7 red and 9 black balls. Tell whether or not the trials of drawing balls are Bernoulli trials when after each draw the ball drawn is (i) replaced (ii) not replaced in the urn.

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is red ?