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December 19, 2014

December 19, 2014

Posted by **Ellie** on Sunday, October 25, 2009 at 3:46pm.

???

- math -
**bobpursley**, Sunday, October 25, 2009 at 4:03pmlooks like an arithemetic progression, is 10, then each row increases by 6

Isn't there a neat formula for that?

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