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QJEEM19Mac329: JEE Main 2019 Mathematics - Class 11 JEEM19Mac329 Solution: Suppose that 20 pillars of the same height have been erected…

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 :

Multiple Choice Options

  • A 180
  • B 210
  • C 170
  • D 190

Step-by-Step Verified Solution

JEE Main 2019 (Online) 10th April Evening Slot Mathematics - Permutations and Combinations Question 147 English Explanation Any two non-adjacent pillers are joined by beams

∴ number of beams = number of diagonals = 20C2 - 20 = 170

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