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There are 5 points P 1 , P 2 , P 3 , P 4 , P 5 on the side AB, excluding A and B, of a triangle ABC. 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 CA of the triangle. The number of triangles, that can be formed using the points P 1 , P 2 , …, P 18 as vertices, is :

1. 776
2. 751
3. 796
4. 771

Correct answer: 751

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