Points on a Plane 2

Fifteen points \(P_1,P_2,\ldots,P_{15}\) are drawn in the plane in a such way that besides \(P_1,P_2,P_3,P_4,P_5\) which are collinear,no other \(3\) points are collinear.Find the number of triangles whose vertices are \(3\) of the \(15\) points.

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