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  5. Number System and its Operations

SSC Quantitative Aptitude Number System and its Operations Question Bank Set Theory (II)

  • question_answer
    If \[n\,(A)=3,\]\[n\,(B)=6\]and \[A\subseteq B.\] Then, the number of elements in \[A\cup B\]is equal to

    A) 3

    B) 9

    C) 6

    D) None of these

    Correct Answer: C

    Solution :

    [c] \[\because \]\[n\,(A)=3,\]\[n\,(B)=6\] \[\because \]\[n\,(A\cup B)=n\,(A)+n\,(B)-n\,(A\cap B)\] \[=3+6-3\] \[=6\]


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