MathForces: Math Olympiads
MathForces - Math Olympiadsβeta
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Author: mathforces
Problem has been solved: 12 times

Русский язык | English Language

8 students participate in the CMC competition from the country of mathematicians. Before the competition, some of them shook hands, but every participant shook exactly two hands. The team leader, watching this, wrote out a list of unordered pairs of participants who shook hands with each other. If an order doesn't matter, how many different lists could he get?
Note: after each handshake, participants sanitized their hands with a sanitizer.

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