### Tell us what’s happening:

Okay, so I got the code right, but what I don’t understand is, why does

(`sum([2, 3, 4], 1)`

should equal 2)

I thought, we start counting from 0. so then, should not the answer would be 5? Because 2+3=5. Please, I try asking ChatGPT for hours and still could not be satisfied with any explanation.

### 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/119.0.0.0 Safari/537.36 Edg/119.0.0.0`

### Challenge Information:

Basic JavaScript - Replace Loops using Recursion