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 form a regular polygon of 2n + 1 sides such that the centre of the polygon lies inside the triangle is

The number of rectangles that can be obtained by joining four of the twelves verties of a 12-sides regular polygon is -

The number of different quadrilaterals that can be formed by using the vertices of a regular decagon, such that quadrilaterals has no side common with the given decagon, is

Let T_n denote the number of triangles, which can be formed using the vertices of a regular polygon of n sides. It T_(n+1)-T_n=21 ,then n equals a. 5 b. 7 c. 6 d. 4

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

Find the number of diagonals by joining the vertices of a polygon of n sides.

Find the number of triangles which can be formed having vertices at angular points of a convex polygon of m sides.

How many quadrilaterals can be formed joining the vertices of a convex polygon of n sides?

Consider a polygon of sides 'n' which satisfies the equation 3*^(n)P_(4)=^(n-1)P_(5) . Q. Number of quadrilaterals thatn can be formed using the vertices of a polygon of sides 'n' if exactly 1 side of the quadrilateral in common with side of the n-gon, is

Find the number of diagonals that can be drawn by joining the angular points of a a polygon of 20 sides.