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 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 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

A urn contains 4 white and 6 red balls. Four balls are drawn at random (without replacement) from the urn. Find the probability distribution of the number of white balls.

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