\left| \begin{array} { r r } { 2 } & { 4 } \\ { - 5 } & { - 1 } \end{a – InterviewSolution

1.	\left\| \begin{array} { r r } { 2 } & { 4 } \\ { - 5 } & { - 1 } \end{array} \right\|
Answer» determinant is = 2 ×(-1) - 4×(-5) = -2 +20 = 18

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