There are n points in a plane of which p...

There are n points in a plane of which p points are collinear. How many lines can be formed from these points?

`""^(n)C_(2)-""^(p)C_(2)`

`""^(n)C_(2)-""^(p)C_(2)+1`

`""^(n)C_(2)-""^(p)C_(2)-1`

`""^(n-p)C_(2)`

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