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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 either in tests I and II or tests I and III. The probabilities of the student passing in tests I, II, and III are, respectively, p, q, and 1/2. then p(1+q)=

A

p = q =1

B

`p = q = (1)/(2)`

C

`p =1, q = 0`

D

`p = 1, q = (1)/(2)`

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The correct Answer is:
B
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