IOM 2017, Блиц — Задача 36

OLYMPIAD OF METROPOLISES. Moscow, September 4 · 4 септември 2017 г.

Условие

Several people attended a high school reunion. All attendees shook hands with each other. The total number of handshakes was 435. How many people attended the reunion?

Отговори

Решение

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