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Math Help - Help with a question please?

  1. #1
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    May 2008
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    Help with a question please?

    From a box of 15 distinguishable textbooks (5 Engineering, 6 Psychology, 4 Economics), Sarah
    closes her eyes and randomly arranges 4 books on a shelf. Let E denote the event that all
    books on the shelf are Psychology books, F the event that no Engineering book is selected,
    and G the event that at least one book from each subject is selected. Determine the number
    of outcomes in the following events:
    (a) E^c (E complement)
    (b) F U G
    (c) E^c U F^c (E complement Union F complement)
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  2. #2
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    Joined
    May 2008
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    21

    combinations

    1. 1350,=1365-15
    2. none
    3. 125=
    (5C1)*(4c3)=20
    (5C2)*(4C2)=60
    (5C3)*(4C1)=40
    (5C4)=5
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