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The sum of the first n terms of any arithmetic… | StemPy Lab

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The sum of the first n terms of any arithmetic progression is a quadratic expression in n with no constant term. When does this fail?

MathematicsHardHigh School (9–10)GeneralAlgebra › Sequences and Series Olympiad

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The sum of the first $n$ terms of any arithmetic progression is a quadratic expression in $n$ with no constant term. When does this fail?

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