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December 21, 2014

December 21, 2014

Posted by **mychelle** on Saturday, November 27, 2010 at 10:27pm.

- algebra -
**drwls**, Saturday, November 27, 2010 at 10:50pmThe correct formula is n(n+1)/2, NOT t(n+1)/2

If that number is 325,

n(n+1) = 650, and so

n = 25

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