Sums of Odd Numbers

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You can use arithmetic progressions
That's
Sum of no's=n/2(first no + last)

destroyercs
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I discovered this myself in, like, the 4th grade. The geometric visualization is new to me at 54 years old ... and farking cool as hell. Why didnt 4th grade me see it?

SgtSnausages
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Sum of even numbers is n²+n
😎😎😎😎😎😎😎😎😎😎

oneshot