In a bag there are six balls of unknown colours, three balls are drawn at random and found to be all black. Find the probability that no black ball is left in the bag .

A bag contains 5 balls of unknown colours. A ball is drawn at random from it and is found to be red. Then the probability that all tha balls in the bag are red, is

A bag contains 6 white and 4 black balls.Two balls are drawn at random and one is found to be white.The probability that the other ball is also white is

A bag contains 3 red,4 black and 2 green balls.One ball is drawn at random from the bag,find the probability drawn is black ball?

A bag contains 4 white and 5 black balls. A ball is drawn at random from the bag. Find the probability that the ball drawn is white.

There are two bags containing white and black balls. In the first bag, there are 8 white and 6 black balls and in the second bag, there are 4 white and 7 black balls. One ball is drawn at random from any of these two bags. Find the probability of this ball being black.

( for explanation of law of total probability ) there are two bags . The first bag contains 4 white and 5 black balls and the second bag contains 5 white and 4 black balls , two balls are drawn at random from the first bag and are put into the second bag without noticing their colours , then two balls are drawn from the second bag . find the probability that the balls are white and black.

A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. Find the probability that the balls drawn is not white

A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. Find the probability that the balls drawn is neither white nor black