From an urn containing `a` white and `b` black balls, `k` balls are drawn and laid aside, their color unnoted. Then one more ball is drawn. Find the probability that it is white assuming that k

An urn contains 'a' green and 'b'pink balls k(lt, a,b) balls are drawn and laid a side, their colour being ignored. Then , one more ball is drawn. Find the probability that it is green.

An urn contains 10 white and 3 black balls.Another urn contains 3 white and 5 black balls.Two balls are drawn from the first urn and put into the second urn and then a ball is drawn from the second urn.Find the probability that ball drawn from 2nd urn is white.

Statement-1 : An urn contains m white and n black balls. All the balls except for one ball, are draw from it. The probability that the last ball remaining in the urn is white is equal to m/(m+n) . Statement-2 : An urn contains m white balls and n black balls. Balls are drawn one by one till all the balls are drawn. The probability that the second drawn ball is white is n/(m+n) . Statement-3 : An urn contains 6 balls, 3 white and 3 black ones, a person selected at random an even number of balls (all the different ways of drawing an even number of balls are considered equally probable, irrespective of their number). Then the probability that there will be the same numberof black and white balls among them is 11/15 .

A die is rolled and showing any number is directly proportional to that number. If prime number appears then a ball is chosen from urn A containing 2 white and 3 black balls otherwise a ball is chosen from urn B containing 3 white and 2 black balls Then. If white ball is draw then the probability that it is from urn B

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains W white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probability that this procedure for drawing the balls will come to an end at the rth draw.

A bag contains 4 white balls and 3 black balls. If two balls are drawn at random, then mean of number of white balls is

One bag contains 4 white and 5 black balls. Another bag contains 6 white and 7 black balls. A ball is transferred from first bag to the second bag and then a ball is drawn from the second bag. Find the probability that the ball dawn is white.

One bag contains 4 white and 5 black balls. Another bag contains 6 white and 7 black balls. A ball is transferred from first bag to the second bag and then a ball is drawn from the second bag. Find the probability that the ball dawn is white.

An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.