InterviewSolution
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| 1. |
\left. \begin{array} { | c | c | c | c | } \hline 8 & { 2 } & { 6 } & { 5 } \\ \hline 4 & { 3 } & { 9 } & { 1 } \\ \hline \end{array} \right. |
| Answer» | |