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(x−1)(x−2)⋅⋅⋅(x−n) (x-1)(x-2) \cdot \cdot \cdot (x-n)(x−1)(x−2)⋅⋅⋅(x−n)
The coefficients of xn−2x^{n-2}xn−2 in the expansion above is equals to?
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