Why did we use n+1 in the range() function?

In this code:

def calculate_sum(n):
    
    total = 0
    
    for i in range(n+1):
        total += i
    
    return total
    
result = calculate_sum(100)
print(result)    # 5050

When you pass n to the range() function, it'll only iterate from i = 0 to i = n - 1.

So, to make sure it includes i = n as well, you need to pass n + 1 to the range() function.

This ensures the loop runs all the way from 0 up to n, giving you the desired sum.

Hope this helps. Let me know if you need more help or have further questions. I'm happy to help.