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Fixed error in Exercise 19.3.1 #604

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Fixed error in Exercise 19.3.1 #604

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2 changes: 1 addition & 1 deletion functions.Rmd
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Expand Up @@ -347,7 +347,7 @@ f3 <- function(x, y) {

<div class="answer">

The function `f1` tests whether each element of the character vector `nchar`
The function `f1` tests whether each element of the character vector `string`
starts with the string `prefix`. For example,
```{r}
f1(c("abc", "abcde", "ad"), "ab")
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