calculati suma:
[tex] \frac{1}{3} + \frac{1}{ {3}^{2} } + \frac{1}{{3}^{3} } + \frac{1}{ {3}^{4} } + \frac{1}{ {3}^{5} } + \frac{1}{ {3}^{6} } [/tex]
​