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JEE Main & Advanced JEE Main Paper (Held on 10-4-2019 Afternoon)

  • question_answer
    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 : [JEE Main 10-4-2019 Afternoon]

    A) 210                 

    B) 190

    C) 170

    D) 180

    Correct Answer: C

    Solution :

    Total cases = number of diagonals \[{{=}^{20}}{{C}_{2}}-20=170\]                      


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