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    1) 60% of students are from the south. 60% of them passed the test.
    30% are from the north, and 70% of them passed the test.
    10% are foreign, and 90% of them passed the test.

    If a randomly selected student passed the test, the probability that the student is foreign is_______.

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    let us suppose that we have 1000 students in the class. Then

    600 are from the south and 360 of them passed the ...

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