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MathNet 2021 — Part 01 Question 58

Math Olympiad Vault · MathNet 2021 — Part 01

Question 58

On a circle, there are $n$ points. Each of them is labelled with a real number at most $1$ such that each number is the absolute value of the difference of the two numbers immediately preceding it in clockwise order.
Determine the maximal possible value of the sum of all numbers as a function of $n$.
(Walther Janous)