(Oct-14-2017, 09:10 PM)sparkz_alot Wrote: The truth of the matter is I saw the formula flash by on a TV show
well, that's the formula for sum of arithmetic progression, it is school math... According to wikipedia (https://en.wikipedia.org/wiki/Arithmetic_progression)
In 499 AD Aryabhata, a prominent mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, gave this method in the Aryabhatiya (section 2.18).