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     EduGorilla 
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    A professor has 24 text books on Computer Science and is concerned about the coverage of the topics (P) Compilers, (Q) Data structures and (R) Operating Systems. The following data gives the number of books that contain material on these topics:
    n(P) = 8, n(Q) = 13, n(R) = 13,
    = 3, , where n(x) is the cardinality of the set x.
    Then, the number of text books that have no material on Compilers is

    Options :-

    1. 4
    2. 8
    3. 12
    4. 16
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