Question

resolva as equaçoes calculando o valor de n Cn2=74

Answer 1

$nC2=74\\\\ \left(\begin{array}{c}n\\2\end{array}\right)=74\\\\\\\dfrac{n!}{2!(n-2)!}=74\\\\\dfrac{n(n-1)(n-2)!}{2(n-2)!}=74\\\\n(n-1)=148\\\\n^2-n-148=0$


Nao existe valor inteiro n ue saisfaca a equacao