in an entrance test, a student has to give 3 tests I, II and III. To qualify, he needs to pass test I and at least one of the other two tests. If the probability of passing test III is 1/2 and that of qualifying is also 1/2. Then which of the following are the probabilities of passing in test I and II respectively ？
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发表于 2013-3-18 11:40:27
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