There are 10 points on a plane of which ...

There are 10 points on a plane of which 5 points are collinear. Also, no three of the remaining 5 points are collinear. Then find (i) the number of straight lines joining these points, (ii) the number of trianglesformed by joining these points.

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The correct Answer is:

`""^(10)C_(3) - ""^(5)C_(3)`

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