Resposta :
[tex]d = \dfrac{n \cdot(n - 3)}{2} [/tex]
[tex]d = \dfrac{12 \cdot(12 - 3)}{2} [/tex]
[tex]d = \dfrac{12 \cdot9}{2} [/tex]
[tex]d = \dfrac{108}{2} [/tex]
[tex]d = 54[/tex]
[tex]d = \dfrac{n \cdot(n - 3)}{2} [/tex]
[tex]d = \dfrac{12 \cdot(12 - 3)}{2} [/tex]
[tex]d = \dfrac{12 \cdot9}{2} [/tex]
[tex]d = \dfrac{108}{2} [/tex]
[tex]d = 54[/tex]