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2013 AMC 12A Question 24

AMC12 · 2013 AMC 12A

Question 24

Three distinct segments are chosen at random among the segments whose endpoints are the vertices of a regular $12$-gon. What is the probability that the lengths of these three segments are the three side lengths of a triangle with positive area?
  1. $\dfrac{553}{715}$
  2. $\dfrac{443}{572}$
  3. $\dfrac{111}{143}$
  4. $\dfrac{81}{104}$
  5. $\dfrac{223}{286}$