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August 31, 2015

Homework Help: math/algebra

Posted by qwerty on Thursday, November 20, 2008 at 10:58pm.

i know how to write/make explicit formulas but i have tried long and hard to find the formula for the sequence 2,7,15,26,40 i know that it increases by "3 more than the last increase" every time but i cant write a equation for it.
it describes the number of total cards of a cardhouse as each bottom layer is added

help

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