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JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Geometrical Problems

  • question_answer
    In a plane there are 10 points out of which  4 are collinear, then the number of triangles that can be formed by joining these points are [RPET 1990]

    A) 60

    B) 116

    C) 120

    D) None of these

    Correct Answer: B

    Solution :

    Required number of triangles \[{{=}^{10}}{{C}_{3}}{{-}^{4}}{{C}_{3}}\]\[=120-4=116\].


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