[tex] > \: resolucao \\ \\ \geqslant \: progressao \: \: geometrica \\ \\ q = \frac{a2}{a1} = \frac{2}{4} = \frac{1}{2} \\ \\ = = = = = = = = = = = = = = = \\ \\ \\ s = \frac{a1}{1 - q} \\ \\ s = \frac{4}{1 - \frac{1}{2} } \\ \\ s = \frac{4}{ \frac{1}{2} } \\ \\ s = 4 \times \frac{2}{1} \\ \\ s = \frac{8}{1} \\ \\ s = 8 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant [/tex]
