From what I've read, and if I am not mistaken, it seems that any BCL method receives its arguments as a tuple in F#. So I was wondering if instead of having

```
let rndNumber= rng.Next(-10, 10)

```

I could have something along the lines of

```
let range = (-10, 10)
let rndNumber = rng.Next range

```

*the full code is the following:*

```
open System
let rng = new Random()
let range = (-10, 10)
let rndNumber = rng.Next range

```

*and the error I'm getting is*

```
This expression was expected to have type
    int    
but here has type
    int * int    

```