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Geometric representation of the square pyramidal number using cubes, instead of sferes, is more useful.
:George Polya, in his book "Mathematical discovery", Volume 2, 1968, presents this solution saying it "rained from the sky", as obtained algebraically with a trick, like a rabbit drawn out from the hat.
Returning to the introduction to this talk page, seems that this geometric derivation is a little more ''direct'' than the algebraic presented in the article.
:In the article "Summation" i entered the talk: "Sum of the first n cubes (geometrical proof)", please to see it.
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