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MathNet 2021 — Part 01 Question 27

Math Olympiad Vault · MathNet 2021 — Part 01

Question 27

Each of the $5$ sides and the $5$ diagonals of a regular pentagon are randomly and independently colored red or blue with equal probability. What is the probability that there will be a triangle whose vertices are among the vertices of the pentagon such that all of its sides have the same color?