A box contains some green and blue balls. 7 red balls are put into. Now the probability of getting a red ball from the box is `7/(24)` and that of a blue ball is `1/3`.
How many of them are blue?

A bag contains 4 red, 6 white and 5 black balls. 2 balls are drawn at random. The probability of getting one red and one white ball is

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 contains 6 red balls and some blue balls. If the probability of drawing a blue ball from the bag is double that of a red ball, find number of blue balls in the bag.

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 bag contaings 3 white 4 black 2 red balls if 2 balls are drawn at random then the probability that both the balls are white is

An urn contains 6 blue and 'a' green balls. If the probability of drawing a green ball is double that of drawing a blue ball, find 'a'.

A bag contains 27 balls of which some are White and others are Red. A ball is choosed at random. The probability of getting a Red ball is 2/3 . Find the number of White balls.

A box contains 3 orange balls, 3 green balls and 2 blue balls. Three balls are drawn at random from the box without replacement. The probability of drawing 2 green balls and one blue ball is

A bag contains 5 red, 8 green, and 7 white balls. One ball is drawn at random from the bag, find the probability of getting: (a) not a white ball, (b) neither a green nor a red ball.