How do I add two lists in Linq so addedList[x] = listOne[x] + listTwo[x]?

Question

I want to add two lists of a numeric type such that addedList[x] = listOne[x] + listTwo[x]

The output of the list needs to be a Generic.IEnumerable that I can use i

Answer 1

var result = 
   from i in 
        Enumerable.Range(0, Math.Max(firstList.Count, secondList.Count))
   select firstList.ElementAtOrDefault(i) + secondList.ElementAtOrDefault(i);