Question Number 188280 by MATHEMATICSAM last updated on 27/Feb/23
$$\mathrm{Prove}\:\mathrm{that}\:\mathrm{1}+\mathrm{2}+\mathrm{3}+\mathrm{4}+.....\:=\:−\frac{\mathrm{1}}{\mathrm{12}} \\ $$
Commented by normans last updated on 27/Feb/23
$$\:{I}\:{think}\:{is}\:{the}\:{old}\:{problem} \\ $$
Commented by JDamian last updated on 27/Feb/23
https://youtu.be/d55P1hwbvYU