Question

Como resolvo essa equação? (An,6 + An , 5)/ An, 4 = 9

Answer 1

n!(n-6)!+n!/(n-5)! / n!/(n-4)!=9
2n!/(n-6)!(n-5)! / n!/(n-4)!=9
2n!/(n-6)!(n-5)! . (n-4)!/n!=9
2n!/(n-6)!(n-5).(n-4)! . (n-4)!/n!=9
n!/(n-6)!(n-5)=9