A bag contains 3 red, 4 white and 7 black balls.The probability of drawing a red or a black ball is

A bag contains 15 white balls and some black balls. If the probability of drawing a black ball is thrice that of a white ball, find the number of black balls in the bag.

A bag contains 15 white balls and some black balls. If the probability of drawing a black ball is thrice that of a white ball, find the number of black balls in the bag.

There are 5 red and 4 black balls in a bag. The probability of drawing a red ball is:

There are 5 red and 4 black balls in a bag. The probability of drawing a red ball is:

A bag contains 10 white, 6 black and 4 red balls. Find the probability of getting : a black ball

A bag contains 3 red, 4 white, and 5 black balls. One ball is drawn at random . If a,b,c are the probabilities of drawing a red, a black ball from the bag then the ascending order of a,b,c is

A bag contains 5 red, 6 white and 7 black balls. Two balls are drawn at random. what is the probability that both balls are red or both are black?

A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the bag at random will be neither red nor black?

A bag contains 5 red, 8 white and 7 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.

A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is red or white.