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Posted by on Apr 3, 2009 in Optical Illusion |

Visually Perceived Image: Blocks

 

Set_Blocks
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Certain blocks have threaded holes; others do not. All the blocks of the same color are identical and all the threaded bolts are equally long. Which set of blocks is incorrect?

Answer: Sets 2 and 8 tell you that the red block has not been threaded.