An examination is attempted by 5000 graduates, 2000 post-graduates and 1000 doctorate holders, The probabilities that a graduate, a post graduate and a doctorate holder will pass the examination are `2/3, 3/4, 4/4` respectively. If one of the examine passed the examination, then the probability that he is a post-graduate is

A student is given 6 questions in a true or false examination If he gets 4 or more correct answers he passes the examination.The probability that he passes the examination is

A: If the probabilities of A and B to pass the examination are 2//10, 3//10 then the probability that only one of them to pass the examination is 19//50 . R: If A, B are two events then P(A-B) = P(A)-P( A cap B ).

A college student has to appear for two examinations A and B. The probabilities that the student passes in A and B are 2/3 and 3/4 respectively. If it is known that the student passes at least one among the two examinations, then the probability that the student will pass both the examination is (A) 1/6 (B) 1/2 (C) 1/3 (D) 6/11

If the probability of X to fail in the examination is 0.3 and that for Y is 0.2, then the probability that either X or Y fails in the examination is

The overall percentage of failures in a certain examination is 40. What is the probability that out of a group of 6 candidates at least 4 passed the examination?

the overall percentage of failures in a certain examination is 40 what is the probability that out of a group of 6 candidates at least 4 passed the examination ?

The overall percentage of failures in a certain examination is 40. What is the probability that out of a group of 6 candidates at least 4 passed the examination?

In a class of 10 student, probability of exactly i students passing an examination is directly proportional to i^(2). If a student is selected at random, then the probability that he has passed the examination is

100 students appeared for two examinations. 60 passed the first, 50 passed the second and 30 passed both. Find the probability that a student selected at random has passed at least one examination.