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Posted 02 November 2013 - 02:46 AM
In the illustration four flat cube-like shapes are shown. Their patterns are drawn with bold black lines. Which of them can you draw without taking your pencil off the paper or going along the same line twice? Which of them can't be drawn in this way?
*found this interesting gem online.
Posted 02 November 2013 - 06:01 AM Best Answer
Spoiler for Looks like graph theory...
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