Предмет: Математика, автор: night097

В турнире было 6 игроков. Каждый с каждым сыграл по одной партии. Сколько всего партий было сыграно?

Ответы

Автор ответа: uh19

0

обозначим игроков (для наглядности) - а..б..в..г..д..е

а -б.....а-в....а---г .....а-д....а-е... 5 партий
б-в....б.-г.....б-д....б-е....4 партии
в-г....в-д...в-е.....3 партии
г-д....г-е.....2 партии
д-е...1 партия

5+4+3+2+1=15 партий

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