How to display verbatim inline r code with backticks using Rmarkdown?

Question

By doubling the backticks in Markdown, it is easy to render some text in code style including the backticks, such as: `r 2+2`. But how to do that with RMark

Answer 1

I just learnt about the results='asis' option.
So, yet another way; for fun and learning :-)

```{r, results='asis', echo=FALSE}
cat("`` `r 2+2` ``")
```