J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    There are 12 points in a plane. The number of straight lines joining any two of them, when 3 of them are collinear, is

    A)  \[60\]                

    B)  \[63\]

    C)  \[64\]                 

    D)  \[65\]

    Correct Answer: B

    Solution :

    Required number ways \[{{=}^{12}}{{C}_{2}}{{-}^{3}}{{C}_{1}}\] \[=\frac{12\times 11}{1\times 2}-3\] \[=6\times 11-3\] \[=66-3=63\]


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