i can not run chunks in RStudio markdown html should i inst

i can not run chunks in RStudio ( markdown html)

should i install pakages

i installed rmarkdown and markdown

my code

```{r}
best.aic
    ```

Solution

R code chunks can be used as a means render R output into documents or to simply display code for illustration. Here is a simple R code chunk that will result in both the code and it