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JEE Main & Advanced Mathematics Sets Question Bank Set theory

  • question_answer
    If \[A=\{2,\,4,\,5\},\,\,B=\{7,\,\,8,\,9\},\] then \[n(A\times B)\] is equal to

    A) 6

    B) 9

    C) 3

    D) 0

    Correct Answer: B

    Solution :

    A × B = {(2, 7), (2, 8), (2, 9), (4, 7), (4, 8), (4, 9),     (5, 7), (5, 8), (5, 9)} n(A × B) = n . n = 3 × 3 = 9.


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