PNC

N(even) sided polygon with N vertices is made when n points are joined to form straight lines so number of point of intersection of those lines are 
Ans  not known.

@YouKnowwhere
I dont understand what you are saying.

@ashishdeosingh We first make n sided polygon and by using its n vertices we draw straight lines ( by doing nc2) so i am asking no. of pt of intersection of those lines.