The number of triangles that can be formed form a regular polygon of 2n + 1 sides such that the centre of the polygon lies inside the triangle is

The number of triangle that can be formed by joining the vertices of a regular polygon of n sides is

The number of triangles that can be formed using the vertices of a 20 sided regular polygon such that the triangle and the polygon does not have any side common is

The number of triangles that can be formed using the vertices of a 20 sided regular polygon such that the triangle and the polygon does not have any side common is

The number of triangles which can be formed by using the vertices of a regular polygon of (n + 3) sides is 220. Then n =

The number of diagonals of a regular polygon of n sides are:

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

Let T_(n) denote the number of triangles which can be formed using the vertices of a regular polygon of n sides . If T_(n+1)-T_(n)=21 then find the values of n .

Let T_n denote the number of triangles which can be formed using the vertices of a regular polygon of n sides . If T_(n+1)-T_n=21 , then n equals :

The number of triangles that can be formed by joining the vertices of a regular polygon of side n is denoted by T_(n) If T_(n+1)-T_(n)=21 then the value of n will be -