jumlah deret geometri tak hingga 54 + 18 + 6+.....adalah...

[tex]a = 54 \\ r = \frac{18}{54} = \frac{1}{3} \\ S = \frac{a}{1 - r} \\ = \frac{54}{1 - \frac{1}{3} } \\ = \frac{54}{ \frac{2}{3} } \\ = 81[/tex]