A student appears for test I and II. The student is successful if he passes either in test I or test II. The probability of the student passing in test I and II are p and `1/3` respectively. If the probability that the student is successful is `1/2` then find the value of p.

A student appears for test I, II and III. The student is successful if he passes, either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II and III are p, q and 1/2 respectively . If the probability that the student is successful is 1/2 then

A student appears for tests I, II and III. The student is successful if he passes either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II, and III are, p,q, 1/2 respectively,if the probability that the student is successful is 1/2 then p(1+q)=

A student appears for tests I, II and III. The student is successful if the passes either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II and III are p,q and (1)/(2) , respectively. If the probability that the student is successful, is (1)/(2) , then

A student appears for tests 1, 2 and 3. The student is successful if he passes either in tests 1 and 2 or tests 1 and 3. The probabilities of the student passing in tests 1, 2 and 3 are p, q and (1)/(2) , respectively. If the probability that the student is successful is (1)/(2) , then

A student appears for tests 1, 2 and 3. The studentis successful if he passes either in tests 1 and 2 or tests 1 and 3. The probabilities of the student passing in tests 1, 2 and 3 are p, q and (1)/(2) , respectively. If the probability that the student is successful is (1)/(2) , then

A student appears for tests 1, 2 and 3. The studentis successful if he passes either in tests 1 and 2 or tests 1 and 3. The probabilities of the student passing in tests 1, 2 and 3 are p, q and (1)/(2) , respectively. If the probability that the student is successful is (1)/(2) , then