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JEE Main & Advanced Mathematics Sets Question Bank Set theory

  • 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 :

    Since\[A\subseteq B,\,\,\,\therefore A\cup B=B\]. So, \[n(A\cup B)=n(B)=6\].


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