Look at this program. This program does things like adding all the numbers from 1 to number for Eg. 6, 1 + 2 + 3 + 4 + 5 + 6 = 21 IMPORTANT only numbers work , not word numbers for Eg. 2 is correct, two is not correct. And don't mind the spirte. Press space
I use this formula: 1+2+3+ ... +n = n(n+1)/2 for positive integer n
