Triangular number: Revision history

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24 January 2009

19 May 2008

  • curprev 07:1507:15, 19 May 2008‎ imported>Karsten Meyer‎ 841 bytes +841‎ New page: A '''triangular number''' represents the number of circles you can arrange to a equilateral triangle. ==Definition== <math>\Delta_n = \sum_{i=1}^n i = \frac{n\cdot (n+1)}{2...
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