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Автор - kulganik80

Ребус : В шахматном турнире участвовали 6 человек. Каждый с каждым сыграл по одной партии. Сколько всего партий они сыграли

Ответ

Автор - svyatoylord
Каждый сыграл с каждым по одной партии=>
6+5+4+3+2+1=21

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