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Mantej Rajpal ↑
@mantej.eth
If you needed to quickly add 1+2+3+4+5+6+7+8+9 in your head how would you do it? No calculators and no need to Google any math tricks or the best way to do it or anything like that. Just curious how others think!
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welp 🎩🌸
@we
n (n+1) / 2 not that hard to remember if you're aware of it
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May
@golludou
One of the few math Olympiad fundamentals that I still remember
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