Solution
= Solution
This <geometric series> has first term $1/27$ and common ratio $1/3$, whose <absolute value> is below one. Consequently its <sum> is
$$
\boxed{\frac{1/27}{1-1/3}=\frac1{18}}.
$$
= Solution
This <geometric series> has first term $1/27$ and common ratio $1/3$, whose <absolute value> is below one. Consequently its <sum> is
$$
\boxed{\frac{1/27}{1-1/3}=\frac1{18}}.
$$