olymmath

TUYMAADA 2022 S7

  • Senior

A 1×5n1 \times 5n rectangle is partitioned into tiles, each of the tile being either a separate 1×11 \times 1 square or a broken domino consisting of two such squares separated by four squares (not belonging to the domino). Prove that the number of such partitions is a perfect fifth power. (K. Kokhas)

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