**Tell us what’s happening:**

Hey everyone I got the solution on my own but my issue is I don’t understand the math aspect. Like product *= **arr [i] [j]**;

**Your code so far**

```
function multiplyAll(arr) {
let product = 1;
// Only change code below this line
for (let i = 0; i < arr.length; i++) {
for (let j = 0; j < arr[i].length; j++) {
// let sum = 2;
product *= arr[i][j];
}
}
// Only change code above this line
return product;
}
multiplyAll([[1, 2], [3, 4], [5, 6, 7]]);
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36`

**Challenge:** Basic JavaScript - Nesting For Loops

**Link to the challenge:**