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Manipal Engineering Manipal Engineering Solved Paper-2010

  • question_answer
    Out of 18 points in a plane no three are in the same straight line except five points which are collinear. The number of straight lines that can be formed joining them, is

    A)  143                                       

    B)  144

    C)  153                       

    D)         None of these

    Correct Answer: B

    Solution :

    The number of straight lines                 \[{{=}^{18}}{{C}_{2}}-{{(}^{5}}{{C}_{2}}-1)=144\]


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