Question

determine a razão da p.a (1/2,1/4,1/8)

Answer 1

$a1=\frac{1}{2}\\\\a2=\frac{1}{4}\\\\\boxed{r=a2-a1=\frac{1}{4}-\frac{1}{2}=\frac{-2}{8}=\frac{-1}{4}}$