Proof: Horizontal tromino covers cells (r,c), (r,c+1), (r,c+2). Their (row+col) mod 3 = (r+c) mod 3, (r+c+1) mod 3, (r+c+2) mod 3 → three consecutive integers mod 3 → all different residues 0,1,2. Same for vertical.
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Let me know how I can assist you further! Proof: Horizontal tromino covers cells (r
If 8 trominoes tile the shape, they would cover: 8 trominoes × 1 square of each color = 8 of Color 0, 8 of Color 1, 8 of Color 2. (r+c+1) mod 3