I am looking at the expansion of a time series

`Series (`

$left(sum_{s=1}^inftyfrac{r}{(1+k)^s}x^{s+1}right)^{-1}$`{x, 0, 2}`

and I get a result like

```
1 + (r x^2)/(1 + k) + SeriesData(x, 0, {}, 0, 3, 1)
```

If I now simplify the above term first, I get $frac{1}{1-frac{x^2 r}{1+k-x}}$. Running the Series-command on the invers of this term, i.e., `Series(1-(x^2 r)/(1 + k - x)`

gives me a different answer then the one above. This seems to be a bug or am I making a mistake here?