Tenho N bolas Brancas e 4 bolas pretas, escolhi 4 bolas, 2 brancas e 2 pretas, sabendo que tenho 60 maneiras de escolha, quantas bolas brancas tenho?
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N²-n-(60x8)/8x3=n²-n-20=0(n-5) (n+4)=0
n=> (5)
RESPOSTA=> (5)
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boa noite, qualquer dúvida só chamar !!