> 
> Using the Ruby language, have the function ArrayAdditionI(arr) take the array of numbers stored in arr and return the string true if any combination of numbers in the array can be added up to equal the largest number in the array, otherwise return the string false. For example: if arr contains [4, 6, 23, 10, 1, 3] the output should return true because 4 + 6 + 10 + 3 = 23. The array will not be empty, will not contain all the same elements, and may contain negative numbers.
> 
> 
> 

Could someone please explain to me why this code starts at 'i=2' and not 'i=0'?

```
def ArrayAdditionI(arr)     
  i = 2

    while i < arr.length
     return true if arr.combination(i).map{|comb| comb.inject(:+)}.include?(arr.max)
     i += 1
   end

 false  

end

ArrayAdditionI(STDIN.gets) 

```

Correct me if I'm wrong but with i=2, the while loop will iterate [2..4] and then stop. But does this allow for all the potential combinations?...=> code works, so obviously it does but I'm just not seeing it.