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Found problems: 1

1998 Abels Math Contest (Norwegian MO), 2
Let be given an $n \times n$ chessboard, $n \in N$. We wish to tile it using particular tetraminos which can be rotated. For which $n$ is this possible if we use (a) $T$-tetraminos (b) both kinds of $L$-tetraminos?
chessboard tetraminos combinatorics