A bag contains 4 green, 6 black and 7 white balls. A ball is drawn at random .The probability that it is either black ball or a white ball is

The sum of the distances of any point on the ellipse 3x²+4y²=24 from its foci is

One ticket is selected at random from 100 tickets numbered 00,01,02,...99. Suppose A and B are the sum and product of the digits found on the ticket. Then P(A=7 | B=0) is given by

The probability that the roots of equation x²+nx+1/2+n/2=0 are real ,where n ε N such that n ≤ 5, is

A and B are two independent events. If the probability that both A and B occur is 1/20 and the probability that neither of them occurs is 3/5, then P(A),P(B)=