Gauss's Addition

Create a function that adds all the numbers together from 1 to n or, if two numbers are given: n to m. The input can be in any order.

Examples

gauss([100]) ➞ 5050 # From the video

gauss([5001, 7000]) ➞ 12001000 # Also ^^

gauss([1975, 165]) ➞ 1937770

Notes

• Try not to use a for or while loop.
• Try not to create a recursive function.
• Use the formula explained in the video.