Resposta :
Resposta:
52
Explicação passo a passo:
[tex]\begin{array}{l}a_{9} =a_{3} +6r\Longrightarrow 66=24+6r\Longrightarrow \boxed{r=\frac{42}{6} =7}\\\\\therefore a_{7} =a_{3} +4r=24+4\cdotp 7\Longrightarrow \boxed{\boxed{a_{7} =52}}\end{array}[/tex]