If k>1, and the determinant of the matrix A², where $\mathrm{A}=\left[\begin{array}{ccc}\mathrm{k}& \mathrm{k\alpha }& \mathrm{\alpha }\\ 0& \mathrm{\alpha }& \mathrm{k\alpha }\\ 0& 0& \mathrm{k}\end{array}\right]$, is k² then |$\mathrm{\alpha }$| =

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