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 :
170
180
210
190
Any two non-adjacent pillars are joined by beams.
no. of beams = no. of diagonals
Option (1) is correct.
Option 1)
170
Option 2)
180
Option 3)
210
Option 4)
190
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