InterviewSolution
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| 1. |
\left| \begin{array} { c c c } { 1 } & { 1 } & { 1 } \\ { 1 } & { 1 + x } & { 1 } \\ { 1 } & { 1 } & { 1 + y } \end{array} \right| = x y |
| Answer» | |