a list is given arr = [2, 1, 10, 5] Write a function with a for list that sums all the numbers in the list with each other ((2+1)+(2+10)+(2+5)+(1+10)+(1+5)+(10+5) ) The result should be this: res = 54

def magic(arr):
  result = 0
  for i in range(len(arr)):
    for j in range(i+1, len(arr)):
      result = result + (arr[i] + arr[j])
  return result
  
magic(arr)