Suppose that 20 pillars of the same height have been erected along the boundary of a circu…

Question

Suppose that 20 pillars of the same height have been erected along the boundary of a circular stadium. If the
top of each pillar has been connected by beams with the top of all its non-adjacent pillars, then the total
number of beams is :

Accepted Answer

Any two non-adjacent pillers are joined by beams

$$ \therefore $$ number of beams = number of diagonals = 20C2 - 20 = 170

Solutions · 1