From a bag containing 5 black and 7 white balls, 3 balls are drawn in succession . Find the probability that
each colour is represented.

From a bag containing 5 black and 7 white balls, 3 balls are drawn in succession . Find the probability that all three are of the same colour.

A bag contains 5 red, 7 green and 4 white balls. 3 balls are drawn one after another without replacement. Find the probability that out of 3 balls, one is white and 2 is green.

A bag contains 5 red, 7 green and 4 white balls. 3 balls are drawn one after another without replacement. Find the probability that the balls are white, green and green, respectively.

A bag contains 7 white and 9 black balls. If a ball is drawn at random, what is the probability that it is white?

A bag contains 4 white and 5 black balls. Another bag contains 9 white and 7 black balls. A ball is transferred from the first bag to the second bag and then a ball is drawn at random from the second bag. Find the probability that the ball drawn is white.