There are 10 stations between two cities A and B. A train is to stop at three of these 10 stations. The probability that no two of these three stations are consecutive is

I: A box contain 20 screws, 5 of which are defective, 2 screws are drawn at random.The probability of event that neither of the two screws is defective is 21/38.

II: A box contains 5 black, 4 white and 6 red balls. 2 balls are drawn without replacement. The probability that the first will be white and the second will be black is 4/21

The probability that India wins a cricket match against England is given to be 1/3.If India and England play, 3matches, what is the probability that India will loose all three matches is

Bag A contains 3 white and 2 black balls. Bag B contains 2 white and 4 black balls. One bag is selected at random and a ball is drawn from it. The probability that it is white is

In a class 40% students study History, 25% Civics, 15% both history and Civics. A student fromthe class is selected at random. The probability that he studies history ifit is known that he studies civics is

There are 25 st5amps numbered from 1 to 25 in a box. If a stamp is drawn at random from the box, the probability that the number on the stamp will be a prime number is

The perpendicular distance of radical axis determined by the circles x²+y²+2x+4y-7=0 and x²+y²-6x+2y-5=0 from the origin is

A bag contains 3 red, 4 white and 5 black balls. One ball is drawn at random. If a,b,c are the probabilities of drawing a red a white, a black ball from the bag then the ascending order of a,b,c  is

One number is selected at random from 1 to 100. The probability that it is a prime number is

Urn A contains 6 red and 4 black balls and urn B contains 4 red and 6 black balls. One ball is drawn at random from urn A and placed in urn B. Then one ball is drawn at random from urn B and placed in urn A. if one ball is now drawn from urn A, the probability that it is found to be red is