In honor of Carl Gauss [No Calc!]
Algebra
Level
1
What is
\[\large1+2+3+4+5+\cdots+98+99+100=?\]
or
\[\large\sum_{n=1}^{100} n=?\]
\[\text{Do not use a calculator, not even} \, \Large\color{blue}{\text{G}}\color{red}{\text{o}}\color{yellow}{\text{o}}\color{blue}{\text{g}}\color{green}{\text{l}}\color{red}{\text{e}}\color{black}{!}\]
by
Bloons Qoth