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Problem 357

Combinatorics Difficulty 2.0 Find the answer CEMC Gauss (Grade 7) · Canada · 1999

The floor of a rectangular room is covered with square tiles. The room is $10$ tiles long and $5$ tiles wide. The number of tiles that touch the walls of the room is

(A) $26$ (B) $30$ (C) $34$ (D) $46$ (E) $50$

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