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Proof without Words: Triangular Sums

Yukio Kobayashi
The College Mathematics Journal
Vol. 44, No. 3 (May 2013), p. 189
DOI: 10.4169/college.math.j.44.3.189
Stable URL: http://www.jstor.org/stable/10.4169/college.math.j.44.3.189
Page Count: 1
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Abstract

Summary A visual proof that the triangular numbers are sums of every other odd number.

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