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Not sure whether this question is correct or not! Please help. Thanks.

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    $\begingroup$ The squares already filled in don't even meet that criteria. $\endgroup$ – Badr B Jun 10 '18 at 13:05
  • $\begingroup$ Yes, this is from one of the competitive Exam paper $\endgroup$ – Dinesh Sunny Jun 10 '18 at 13:07
  • $\begingroup$ Presumably the question refers to unfilled in rows, columns and diagonals in which case it is not a magic square $\endgroup$ – James Arathoon Jun 10 '18 at 13:10
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    $\begingroup$ The question is flawed then. Even if we were to assume they meant $7$ instead of $3$, that would mean that the top right corner would have to be $0$, but then that diagonal would only equal $3$, not $7$. There's no solution. $\endgroup$ – Badr B Jun 10 '18 at 13:10
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    $\begingroup$ Maybe, it is meant modulo $4$, but in this case, the exercise is made up badly. $\endgroup$ – Peter Jun 10 '18 at 13:14
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If the upper left number was $-2$ instead of $2$, then the answer would be

\begin{array}{|r|r|r|} \hline \color{red}{-2} & 5 & 0 \\ \hline \color{red}{3} & \color{red}{1} & -1 \\ \hline \color{red}{2} & -3 & \color{red}{4} \\ \hline \end{array}

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