An urn contains 4 balls. Two balls are drawn at random from the urn (without replacement) and are found to be white. What is the probability that all the four balls in the urn are white ?

A bag contains 5 balls. Two balls are drawn and are found to be white. What is the probability that all the balls are white?

An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both balls are black?

An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are black?

A bag contains some white and some black balls, all combinations of balls being equally likely. The total number of balls in the bag is 10. If three balls are drawn at random without replacement and all of them are found to be black, the probability that the bag contains 1 white and 9 black balls is

An urn contains 7 white and 3 red balls two balls are drawn together at random from this urn compute the probability that neither of them is white find also the probability of getting one white and one red ball hecne compute the expecteed numbr of white balls

A box contains 7 white and 5 black balls. If 3 balls are drawn simultaneously at random with out replacement, what is the probability that they are not all of the same colour ?

There are two bags, bag I and bagII. Bag I contains 4 white 3 red balls while bag II contains 3 white and 7 red balls. One ball is drawn at random from one of the bags and it is found to be white. Find the probability that it was drawn from bag I.

There are two bags I and II. Bag I contains 3 white and 4 black and bag II contains 5 white and 6 black balls. One ball is drawn at random from one of the bags and is found to be white. Find the probability that is was drawn from bag I.

A bag contain n ball out of which some balls are white. If probability that a bag contains exactly i white ball is proportional to i^2 . A ball is drawn at random from the bag and found to be white, then find the probability that bag contains exactly 2 white balls.

A box contains 12 red and 6 white balls. Balls are drawn from the bag one at a time without replacement. If in 6 draws, there are at least 4 white balls, find the probability the exactly one white ball is drawn in the next two draws. (Binomial coefficients can be left as such.)