Science Quiz / Gauss summation

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Can you name the correct sum?

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1+2+3+...+98+99+100 = ?
1+2+3+...+48+49+50 = ?
1+2+3+...+78+79+80 = ?
1+2+3+...+18+19+20 = ?

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Six Sixes in Sixty: History

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History 60s
We're just speedrunning all of history to make things efficient.
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Created Nov 18, 2009ReportNominate

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