Points on a Plane 1

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 straight lines which pass through at least 2 of the 15 points.

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