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A student appears for tests I, II and II...

A student appears for tests I, II and III . The student is successful if he passes in tests I , II or III. The probabilities of the student passing in tests, I, II and III are respectively p,q and `(1)/(2)`. If the probability of the students to be successful is `(1)/(2)`. Then

A

a) p(1 + q) = 1

B

b) q(1 + p) = 1

C

c) pq = 1

D

d) 1/p + 1/q = 1

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