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Mathematics

There are 30 students in the class. 16 of them study french and 21 study spanish. They all study at least one of the two languages. What is the probability that a student chosen at random studies french only?

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  1. If x study both, then
    16+21-x = 30
    x = 7
    so, 16-7 = 9 study French only
    now finish it off

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    oobleck

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