IOM 2018, Блиц, английски — Задача 1

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

There are 903 people such that no two of them have the same age. They sit around the table in a random order. Find the expected value of the number of people who are older than both of their neighbours.

Отговори

Решение

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Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf