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Mathematics, 05.06.2020 00:58 seaotter7140

The "border number" of an n times n square is defined as the number of unit squares whose edges border the edges of a larger square. The border numbers of 1 times 1, 2 times 2, 3 times 3,4 times 4 and 5 times 5 squares are illustrated. What is the border number of a 20 unit by 20 unit square?

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