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 beams is:
Correct Option: , 3
Solution:
Total cases $=$ number of diagonals
$={ }^{20} C_{2}-20=170$
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