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numa pesquisa feita com 1000 familias para se verificar a audiencia dos programas de televisão os seguintes resultados foram encontrados :510 familia assistem ao programa A,305 assistem ao programa B,386 assistem ao programa C,sabe-se ainda que 180 familias assistem aos programas A e B ,60 assistem aos programas B e C,25 assitem A e C ,e 10 assistem aos três programas. a)quantas familias não assistem a nenhum desses programas? b)quantas familias assistem somentes ao programas A ? c)quantas familias não assistem nem ao programa A nem ao programa B?
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