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15 Triominoes (Posted on 2016-07-26) Difficulty: 3 of 5
A tiling is said to be fault free if there are no straight lines which can split the tiling without intersecting a tile.

Two L-triominoes trivially form a fault free tiling of a 2x3 rectangle.

Find a fault-free tiling of a 9x5 rectangle using 15 L-triominoes.

No Solution Yet Submitted by Brian Smith    
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Harder case | Comment 2 of 4 |
I found a solution very easily.  Then I found over a dozen more.

Not only is this puzzle simple, it is impossible to fail!

I was able to prove that any tiling of a 9x5 rectangle with L-triominoes must be fault-free.  

  Posted by Jer on 2016-07-27 08:58:07
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