There are 5 points P1, P2, P3, P4, P5 on the side AB, excluding A and B, of a triangle ABC. Similarly there are 6 points P6, P7, …, P11 on the side BC and 7 points P12, P13, …, P18 on the side CA of the triangle. The number of triangles, that can be formed using the points P1, P2, …, P18 as vertices, is :
1
776
2
751
3
796
4
771