courtney-parker_60b1693664f9a
courtney-parker_60b1693664f9a
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(n-2)(n-3)(n-4)! =2 (n-4)! n^2-5n+6-2=0 n^2-5n+4=0 n=(5+ou-V25-16)/2 n=(5+ou-3)/2 n'=1 n"=4 Jogando o 1 lá. (-1)!=... Errado N pertence aos naturais Então é 4. 2!=0!*2 2=2 verdade vlw!