Difference between revisions of "Triangular numbers"
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(Created page with "The triangular numbers $T_n$ represent the number of ways to draw an equilateral triangle as in the first image below. <div align="center"> <gallery> File:First six triangula...") |
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Revision as of 20:47, 21 June 2016
The triangular numbers $T_n$ represent the number of ways to draw an equilateral triangle as in the first image below.