Comment on What are the most mindblowing fact in mathematics?

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emax_gomax@lemmy.world ⁨1⁩ ⁨year⁩ ago

Yep. N * (n + 1) / 2.

You can think of it as.

   1     + 2   +  3  + 4    ... 100
+ 100 + 99 + 98 + 97  +  1

101 + 101 + 101 ... 101
= 2 * sum(1+2+3...100)

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