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Proof without Words: A Triangular Sum

by Roger B. Nelsen (Lewis & Clark College)

This article originally appeared in:
Mathematics Magazine
December, 2005

Subject classification(s): Number Theory | Algebra and Number Theory
Applicable Course(s): 4.3 Number Theory

A sum is visually presented.

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Capsule Course Topic(s):
Number Theory | Number Sequences
Number Theory | Numbers With Special Forms or Properties
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