Hi,

So i'm kind of lost with this exercise. I found the correct answer by using the hints, but i just don't understand why we must use "Sum = 2".

My code looks like this :

```
my_array = [1, 2, 3, 4, 5]
sum = 2
my_array.each do |n|
sum = n*n
puts sum
end
```

And i found out it was correct but... why sum = 2 on line 2 ? I get why sum = n*n since i needed to multiple each value with itself but i'm really lost about the line 2. Does someone have an explanation ?

Thanks a lot !