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Problem of the Week 890

Reconstruct the Dominoes

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The diagram below shows a complete set of dominoes. Find where all the dividing lines are.

NOTE: A typical set of dominoes consists of 28 dominoes with all pairs from

 and   through to 

If you have never seen a domino: The pair ab is the same as the pair ba.

Source: Andy Liu, Univ. of Alberta, in Mathematics and Informatics Quarterly, volume 9, no. 2, June 99 p. 76.

© Copyright 1999 Stan Wagon. Reproduced with permission.

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