I keep getting errors. What is the proper syntax for comparing vectors using same_n?

Question

##### (b) comparing vectors

> Given two users's preferences between two options: [Facebook, Instagram], [Firefox, Chrome], [Mac, PC], [Summer, Winter].

- how many things do they aggree on and how many do they not?

```{r, eval = TRUE}

mike <- c("Instagram", "Chrome", "Mac", "Summer")

cole <- c("Facebook", "Chrome", "PC", "Winter")

same_n # edit me

same_n

diff_n

diff_n

```

Answer 1

sum(mike == cole)

sum(mike != cole)

You may have to be careful with how you handle NAs.