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From: Tim <email@example.com> To: Teacher2Teacher Public Discussion Date: 2007012419:53:07 Subject: boarders If you are to extend this to 3D to gain higher marks, then you should be using Sigma. Oce you have the formula, you can easily find in a textbook or internet how to remove the sigma so you are left with a big fat nth term which, after hours of multiplying out and simplifying will give you a short simple answer.
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