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Proof without words

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2005-12-01
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Copyright (c) 2005 Zoltán Kátai

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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Kátai, Z. (2005). Proof without words. Teaching Mathematics and Computer Science, 3(2), 311-312. https://doi.org/10.5485/TMCS.2005.0103
Abstract
Let us prove: If we add 1 to the product of four consecutive natural numbers, we get a square number:…