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\begin{array} { l } { \text { Transform } \left[ \begin{array} { c c c } { 1 } & { - 1 } & { 2 } \\ { 2 } & { 1 } & { 3 } \\ { 3 } & { 2 } & { 4 } \end{array} \right] } \\ { \text { triangular matrix } } & { \text { by suitable row } } \\ { \text { transformations. } } \end{array} |
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