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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?

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    @mixedmath I think he means the formula for the sum of the arithmetic progression, not the formula for the arithmetic progression2012-07-17
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    @ThomasAndrews: That makes more sense. I'll delete my answer.2012-07-17

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