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

  • question_answer
    In a city, 20% of the population travels by car, 50% travels by bus and 10% travels by both car and bus. Then, persons travelling by car or bus is

    A) 80%

    B) 40%

    C) 60%

    D) 70%

    Correct Answer: C

    Solution :

    [c] \[n\,(C)=20,\]\[n\,(B)=50,\]\[n\,(C\cap B)=10\] Now,\[n\,(C\cup B)=n\,(C)+n\,(B)-n\,(C\cap B)'\] \[=20+50-10=60\]


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