Line L₁ of slope 2 and line L₂ of slope 1 2 intersect at the origin O . In the first quadrant, P ₁, P ₂, . P ₁₂ are 12 points on line L₁ and Q₁, Q₂, . . Q₉ are 9 points on line L₂ . Then the total number of triangles, that can be formed having vertices at three of the 22 points O , P ₁, P ₂, P ₁₂ , Q ₁, Q ₂, . Q ₉ , is: