At a selection, the probability of selection of A is 1/7 and that of B is 1/5.The probability that both of them would not be selected is

The eccentricity of the ellipse 25x²+9y²-150x-90y+225=0 is

In a town 40% people red Enadu, 25% people read jyothi and 15% people read both. A person is chosen at random from the town. The probability that the person chosen read Enadu but not read jyothi is

6 boys and 4 girls sit around a round table at random. The probability that the no two girls sit together is

100 tickets are numbered as 00, 01, 02,...,09, 10, 11,...99. When a ticket is drawn at random from them and if A is the event of getting 9 as the sum of the numbers on the ticket, then P(A)=

A bag contains 5 red, 3 black balls and another bag contains 4 red and 5 black balls. One of the bags is chosen at random and a draw of two balls is made from it. The chance that one id red and the other is black is

A lot consists of 12 good pencils, 6 with minor defects and 2 with major defects. A pencil is drawn at random. The probability that this pencil is not defective is

Mr. A is called for 3 interviews .There are 5 candidates at the first interview, 4 at the second and 6 at the third .If the selection of each candidates is equally likely then the probability that A will be selected for at least  one post is

A bag contains2whit, 3 black and 4greenballs. If2 balls are drawn from it, one after another then the probability that the first one is white and the second one is black is

From an urn containing 3 white and 5 black balls , 4 balls are transfered in to an empty urn. From this urn a ball is drawn and found to be white. The probability that out of four balls transfered 3 are white and 1 is black is