**Tell us what’s happening:**

I’m trying to make a general formula for factorial and implement the same here.

its n! = n((n-1)(n-2)…(n-(n-1)).I can’t proceed any further.

**Your code so far**

```
function factorialize(num) {
for(var i = 0; i < num;i--){
num * (num -1)*(num -2) .......(I'm stuck here
}
return num;
}
factorialize(5);
```

**Your browser information:**

Your Browser User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36`

.

**Link to the challenge:**

https://www.freecodecamp.org/challenges/factorialize-a-number