1.

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

Answer»

`""^(n)C_(2)-""^(r)C_(2)`
`""^(n)C_(2)-""^(r)C_(2)+1`
`""^(n)C_(2)-""^(r)C_(2)-1`
None of these

ANSWER :B


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