Three vertices of a convex \( n \) sided polygon are selected. If t...

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Three vertices of a convex \( n \) sided polygon are selected. If the number of triangles that can be constructed such that none of the sides of the triangle is also the side of the polygon is 30 , then the polygon is a
\( \mathrm{P} \)
(A) Heptagon
(B) Octagon
(C) Nonagon
(D) Decagon
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