Challenge: Sum of Lists

Problem statement

In this challenge, you need to create a recursive function, sum, which returns the total sum of the integers in a List.

Input

The input of the function is a list of integers, numberList, and the index of the last item in numberList.

Output

The output will be the sum of all the integer in numberList.

Sample input

sum([1,2,3,4,5], 4)

Sample output

15

Test yourself

Write your code in the given area. Try the exercise by yourself first, but if you get stuck, the solution has been provided. Good luck!