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

" Total number of rectangles which can be formed using the vertices of "16" sided regular polygon 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 twelve vertices of a 12 - sided regular polygon is :

The number of rectangles that can be obtained by joining four of the twelve vertices of a 12- sided regular polygon is 5K, then the value of K 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

There is a 25 sided polygon (not necessarily regular) inscribed in a circle. The maximum number of pentagons that can be made by using the vertices of the polygon is ? The maximum number of octagons that can be made by using the vertices of the polygon such that A_5, A_8& A_13 are never used while A_10 and A_20 are always used is ? The maximum number of triangles that can be made by using the vertices of the polygon such that there are atleast two but unequal number of vertices of the polygon between any two vertex of the triangle

Number of triangles that can be made using the vertices of a polygon of 10 sides as their vertices and having exactly one side common with the polygon is 10k, then k =