Question: 3. A standard certification test was given at three locations. 1,000 candidates took the test at location A, 600 candidates at location B, and 400

3. A standard certification test was given at three locations. 1,000 candidates took the test at location A, 600 candidates at location B, and 400 candidates at location C. The percentages of candidates from locations A. B, and C who passed the test were 70%, 68%, and 77%, respectively. One candidate is selected at random from among those who took the test. (1) What is the probability that the selected candidate passed the test? (11) If the selected candidate passed the test, what is the probability that the candidate took the test at location B

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