Pela fórmula [tex]d= \frac{n.(n-3)}{2} [/tex], temos:
a) [tex]d= \frac{18.(18-3)}{2}[/tex]
[tex]d= \frac{18.15}{2} [/tex]
[tex]d= \frac{270}{2} [/tex]
[tex]d=135[/tex]
b) [tex]d= \frac{9.(9-3)}{2}
[/tex]
[tex]d= \frac{9.6}{2} [/tex]
[tex]d=27[/tex]
c)[tex]d= \frac{11.(11-3)}{2} [/tex]
[tex]d= \frac{11.8}{2} [/tex]
[tex]d=44[/tex]
d)[tex]d= \frac{30.(30-3)}{2} [/tex]
[tex]d= \frac{30.27}{2} [/tex]
[tex]d=405[/tex]
