જો $ A =\left[ {\begin{array}{*{20}{c}}2&0&0\\0&2&0\\0&0&2\end{array}} \right]$ અને $B = \left[ {\begin{array}{*{20}{c}}1&2&3\\0&1&3\\0&0&2\end{array}} \right],$ તો $|AB| =\ ....... . . .$
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જો શ્રેણિક $A=\left(\begin{array}{cc}0 & 2 \\ K & -1\end{array}\right)$ એ $A\left(A^{3}+3 I\right)=2 I$ નું સમાધાન કરે છે તો $\mathrm{K}$ ની કિમંત મેળવો.