olymmath

VTRMC 2014 Problem 4

    Suppose we are given a 19×1919\times19 chessboard (a table with 19219^2 squares) and remove the central square. Is it possible to tile the remaining 192−1=36019^2-1=360 squares with 4×14\times1 and 1×41\times4 rectangles? (So that each of the 360360 squares is covered by exactly one rectangle.) Justify your answer.

    Dataset text AI-MO AoPS. Quoted with source.

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