Mathematics · Permutations and Combinations
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 si de CA of the triangle. The number of triangles that can be formed using the points P1, P2, ..., P18 as vertices is:
- 1771
- 2796
- 3751✓
- 4776
Correct answer
751
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