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mycus@kbin.social ⁨1⁩ ⁨year⁩ ago

picture a square that is n times n, grid size 1. cut it diagonaly, you have n²/2, but that leaves out the bunch of triangles that are 1/2 each. how many of these triangles are there? n.

so we are left with n²/2 + n/2.

which is (n² + n)/2.

which is n(n + 1)/2.

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