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

Number of quadrilaterals which can be constructed by joining the vertices of a convex polygon of 20 sides if none of the side of the polygon is also the side of the quadrilateral is

Number of quadrilaterals which can be constructed by joining the vertices of a convex polygon of 20 sides if none of the side of the polygon is also the side of the quadrilateral is: (a) 4825 (b) ^17 C_4-^(15)C_2 (c) 2275 (d) 2125

How many triangles can be formed by joining the vertices of a hexagon?

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

How many equilateral triangles can be formed by joining any three vertices of a cube?

How many right angled triangles can be formed by joining the vertices of a cuboid ?

Consider a polygon of sides 'n' which satisfies the equation 3*.^(n)P_(4)=.^(n-1)P_(5) . Q. Number of quadrilaterals that can be made using the vertices of the polygon of sides 'n' if exactly two adjacent sides of the quadrilateral are common to the sides of the n-gon is

Consider a plygon of sides 'n' which satisflies the equation 3. .^(n)p_(4) = .^(n-1)p_(5) Number of quadrilaterals that can be made using the vertices of the polygon of sides 'n' if exactly two adjacent side of the quadrilateral are common to the sides of polygon is

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