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n points are given of which r points are collinear, then the number of straightlines that can be found =(a) ""^(n)C_(2)-""^(r)C_(2)(b) ""^(n)C_(2)-""^(r)C_(2)+1(c) ""^(n)C_(2)-""^(r)C_(2)-1(d) None of these |
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Answer» `""^(n)C_(2)-""^(r)C_(2)` |
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