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\[Sn=\frac{ 6 }{ 10 }+\frac{ 6 }{ 100 }+...\]

Yep, I know that...so what should I do...keep adding?

oh....I see...it is 0.6666

So it tends to 0.66666... in infinity?

And how to write the complete series?

\(\overline{.6}=\frac{2}{3}\)

I knew. So...its tendency and writing the series is the same?

Oh... \[Sn?\frac{ 6 }{ 10 }\times \frac{ 1 }{ 10 }^{n-1}\]

that is an =

are you familiar with sigma notation?

Yep

so...