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January 27, 2015

January 27, 2015

Posted by **Bob** on Wednesday, January 30, 2008 at 10:49pm.

Anyone know how I can do that?

- Math -
**drwls**, Wednesday, January 30, 2008 at 11:23pm99th triangle number = N(N+1)/2 = 4950

Adding 100 to it gives you

4950 + 100 = 5050.

That happens to be the 100th triangle number:

100*101/2

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