Fundamentholfundamenthol
JEE Main2019Math
Q.

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 nonadjacent pillars, then the total number of beams is : 

  1. A

    210

  2. B

    180

  3. C

    170    

  4. D

    190

Solution

Sol. Required number of beams = 20C2 – 20 

 = 190 – 20 = 170 

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