Answer:
The procedure in python 3 is as follows:
def add_range(low,high):
 if low<= high:
 total = 0
 for i in range(low,high+1):
 total+=i
 return total
 else:
 return "Failure"
Step-by-step explanation:
This defines the function/procedure
def add_range(low,high):
If low is less or equal to high
 if low<= high:
Initialize total to 0
 total = 0
Add up numbers in the range
 for i in range(low,high+1):
 total+=i
Return the total
 return total
If low is greater, then return failure
 else:
 return "Failure"