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Suppose A1,A2,A3,........A20 are the ver...

Suppose A1,A2,A3,........A20 are the vertices of a 20 sides regular polygon. triangle with vertices among the vertices of the polygoan are formed, Let m be the number of non-isosceles triangles that can be formed one of whose sides is a side of polygaon and n be the number of non-isosceles trianles that can formed none of whose sides is a side of the polygaon, then A)n=2m B)m+n=960 C) m+n=500 D) n-m=320

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