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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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