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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

`p(1 + q) = 1`

B

`q(1+p) = 1`

C

`pq = 1`

D

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

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The correct Answer is:
A
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TARGET PUBLICATION-PROBABILITY-COMPETITIVE THINKING (ADDITION THEOREM AND CONDITIONAL PROBABILITY)
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