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Generalize This!

Algebra Level 3

$(x-1)(x-2) \cdot \cdot \cdot (x-n)$

The coefficients of $x^{n-2}$ in the expansion above is equals to?

\left (\sum{n} \right )^2

\dfrac{1}{2} \left \{\left (\sum{n} \right )^2- \sum{n^2} \right \}

\left (\sum{n} \right)^2 - \sum{n^2}

\sum{n^2}

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by Parag Zode

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