An urn contains n balls numbered 1,2,...,16. Two balls are drawn randomly without replacement from the urn. Then the probability that the balls have consecutive numbers is 1 8 2 15 1 6 2 5

An urn contains 4 black and 6 red balls. If two balls are drawn at random from the urn without replacement ,then the probability that both are black is

An urn contains 25 balls numbered 1 to 25. Two balls drawn one at a time with replacement. The probability that both the numbers on the balls are odd is

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour is (1) 2/7 (2) 1/(21) (3) 2/(23) (4) 1/3

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour, is

An urn contains 6 red balls and 9 green balls two balls are drawn in succession wihout replacement what is the probability that first is red and second is green .

An urn contains 3 white,4 red and 5 black balls.Two balls are drawn one by one without replacement.What is the probability that at least one ball is black?

A box contains 10 blue and 6 red balls.Two balls are drawn randomly without replacement.The probability that the second ball is blue if it is known that the first is blue,is

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?