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ધારો કે $A=\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & \alpha & \beta \\ 0 & \beta & \alpha\end{array}\right]$ અને $|2 A|^3=2^{21}$ છે જ્યાં $\alpha, \beta \in Z$,તો $\alpha $ ની એક કિંમત ______________ છે.