how to calculate a sum of indicies in a range (1,N)

Question

in python

Answer 1

Easy. Sum of integers from 1-n is given by:

S = { n(n+1) } / 2

If you want the loop variation, then you're going to have to do that yourself, or at least show an attempt.

Answer 2

Is this lesson/ project 36 of Python for Beginners?

If you need help with your approach, please show your code attempt here.

Answer 3

Jay Matthews The list-typecast isn't needed, I guess.