Puzzle #14: The H coins problem
27 July 2019
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From New Scientist #3241, 27th July 2019 [link] [link]
Seven coins have been placed in the “H” shape above. Altogether there are five lines of three, including the diagonals.
Your challenge is to place two more coins so that you can make 10 straight lines of three. No stacking of coins or other sneaky trick is required.
If you find a way to do this, give yourself a silver medal. If you find a second way to do it that isn’t a mirror image of the first, award yourself a gold.