Count of triangles

On each side of an ABCD square is 10 internal points.

Determine the number of triangles with vertices at these points.

Correct answer:

x =  9400

Step-by-step explanation:

C3(40)=(340)=3!(403)!40!=321403938=9880 C3(10)=(310)=3!(103)!10!=3211098=120 n=10  x=(34 n)4 (3n)=(34 10)4 120=9400

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