Resposta:
[tex]\textsf{Leia abaixo}[/tex]
Explicação passo a passo:
[tex]\mathsf{A_{n,3} = A_{n,2}}[/tex]
[tex]\mathsf{\dfrac{n!}{(n - 3)!} = \dfrac{n!}{(n - 2)!}}[/tex]
[tex]\mathsf{\dfrac{n!}{(n - 3)!} = \dfrac{n!}{(n - 2).(n - 3)!}}[/tex]
[tex]\mathsf{1 = \dfrac{1}{n - 2}}[/tex]
[tex]\mathsf{n - 2 = 1}[/tex]
[tex]\boxed{\boxed{\mathsf{n = 3}}}[/tex]
