Summing Singles

Algebra Level 1

\[\color{green}1+ \color{blue}2+ \color{red}3+\color{brown}4+ \color{magenta} 5+\color{brown}6+ \color{red}7+\color{blue} 8+\color{green} 9 = \ \color{RedOrange}? \]

Image Credit: Wikimedia Carl Friedrich Gauß signature
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