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Matemática- Análise Combinatória
FEI- Num campeonato de futebol, as n equipes participantes são divididas em dois grupos, A e B, com o mesmo número de equipes em cada grupo. Todas as equipes jogam entre si em cada grupo, determinando-se uma equipe campeã de cada um. Essas duas equipes disputam o título em uma partida. Se o total de jogos efetuados nesse campeonato é 91, o número n de equipes é:
a)12 b)16 c)20 d)18 e)24
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