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Arithmetic progression homework

by Michael_Light
Tags: progression
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Mar2-11, 10:52 PM
P: 117
1. The problem statement, all variables and given/known data

Need help with number (9).. Click image for larger version

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2. Relevant equations

3. The attempt at a solution

Can anyone give me some hints? Thanks.
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Mar3-11, 04:36 AM
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tiny-tim's Avatar
P: 26,148
Think. Subtract.
Mar19-11, 11:56 PM
P: 44
Sn=3n2 + 4n

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