If P(A/B)=1/4 and P( B/A)=1/3, then P(A)/P(B) is equal to
For two events E1 , E2 if P(E1) =1/2 , P(E2)= 1/3 , P( E1 uE2) = 2/3 then P( E1 nE2 ) is equal to
In the simultaneous tossing of two perfect coins, the probability of having atleast one head is
An urn contains 9 balls, two of which are red, three blue and four black. Three balls are drawn at random. The chance that they are of the same colour is
If A and B are two independent events, the probability that both A and B occur is 1/8 and the probability that neither of them occurs is 3/8. The probability of the occurrence of A is
A number is chosen at random among the first 120 natural numbers. The probability of the number chosen being a multiple of 5 or 15 is