**Tell us what’s happening:**

Describe your issue in detail here.

```
return multiply(arr, n - 1) * arr[n - 1];
please explain me this part why (arr, n - 1) * arr[n - 1]
```

```
**Your code so far**
```

```
function sum(arr, n) {
// Only change code below this line
if(n <= 0)
{
return 0;
}
else
{
return sum(arr, n-1) + arr[n-1];
}
// Only change code above this line
}
```

```
**Your browser information:**
```

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36`

**Challenge:** Replace Loops using Recursion

**Link to the challenge:**