deret geometri tak hingga 4-4/3+4/9-4/27+...=

Diketahui :
a = 4
[tex]r = ( \frac{ - \frac{4}{3} }{4}) \\ = ( \frac{ \frac{4}{9} }{ - \frac{4}{3} }) \\ = - \frac{1}{3} \\ \\ S \infty = \frac{a}{1 - r} \\ = \frac{4}{1 - ( - \frac{1}{3} )} \\ = \frac{4}{ \frac{4}{ 3} } \\ = 3[/tex]
Semoga membantu.