There are 5 points P₁, P₂, P₃, P₄, P₅ on the side A B , excluding A and B , of a triangle A B C . Similarly there are 6 points P ₆, P ₇, , P ₁₁ on the side BC and 7 points P ₁₂, P ₁₃, , P ₁₈ on the side C A of the triangle. The number of triangles, that can be formed using the points P ₁, P ₂, , P ₁₈ as vertices, is :