What is the relation between the general formula of the sum of $n$ terms of an arithmetic progression, $a n^2+b n+c$, and the first term $a+b+c$ and the common difference?
A question about arithmetic progressions, a.k.a. arithmetic sequences
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algebra-precalculus
sequences-and-series
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0@mixedmath I think he means the formula for the sum of the arithmetic progression, not the formula for the arithmetic progression – 2012-07-17
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0@ThomasAndrews: That makes more sense. I'll delete my answer. – 2012-07-17