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JEE Main & Advanced Mathematics Sets Question Bank Set theory

  • question_answer
    In a city 20 percent of the population travels by car, 50 percent travels by bus and 10 percent travels by both car and bus. Then persons travelling by car or bus is  [Kerala (Engg.) 2002]

    A) 80 percent

    B) 40 percent

    C) 60 percent

    D) 70 percent

    Correct Answer: C

    Solution :

    n = 20, n = 50, n(C Ç B) = 10 Now n(C È B) = n + n - n(C Ç B)             = 20 + 50 - 10 = 60. Hence, required number of persons = 60%.


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