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MathNet 2003 — Part 03 Question 21

Math Olympiad Vault · MathNet 2003 — Part 03

Question 21

For which $n$ is it possible to fill the $n$ by $n$ table with $0$'s, $1$'s and $2$'s so that the sums of numbers in rows and columns take all different values from $1$ to $2n$?