Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls if each selection consists of 3 .balls of each colour.

From 4 red balls, 2 white, balls and 4 black balls, four balls are selected. Find the probability of getting 2 red balls

A bag contains some red and green balls If we take a ball from it, without looking the probability of getting a red ball is '1/4' a) What is the total number of balls, if there are 8 red balls? b) What is the probability that a ball taken is green? c) Find the sum of both the probabilities d) From a box containing some red balls and some blue balls the probability of getting a redball is ' a/ b' What is the probability of getting a blue ball?

12 balls are in a box. 5 among them are blue and others are black. Without loọking into the box, one ball is taken a) Find the probability of getting a blue ball? b) After putting one blue ball and one black ball into the basket, a ball is taken. Is the probability of getting a blue ball increases or decreases? Justify your answer.

In a bag there were'3 white balls and 5 black balls.From this one ball is taken,then :What is the probability of being white ball?

A box contains some green and blue balls. 7 red balls are put into it. Now the probability of getting a red ball from the box is 7/24 and that of a blue ball is 1/6 .What is the probability of getting a green ball from the box?

A jar contains 7 black balls, 6 yellow balls, 4 green balls and 3 red balls. All of then are of same size and weight. If a ball is drawn at random, then the probability of th ball being red is

Two balls are selected from two black and two red balls. The probability that the two balls will have no black balls is

In a bag there were'3 white balls and 5 black balls.From this one ball is taken,then :What is the probability of being black ball?