[tex] > resolucao \\ \\ \geqslant progressao \: geometrica \\ \\ q = \frac{a2}{a1} \\ q = \frac{2}{4} \\ q = \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 \\ \\ > < > < > < > < > < > < > > [/tex]
