THE FIFTEEN HEXAGONAL DOMINOES HAVE BEEN PLACED IN A HEX GRID, BUT...

6. The fifteen hexagonal dominoes have been placed in a hex grid, but the bordersof the pieces are not shown. Determine the proper placement of all the dominoesby drawing the borders. The dominoes may be rotated and flipped over, but notoverlapped.

Answer :

2009 AsiaInter-CitiesTeenagersMathematics Olympiad

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