28 July 2016

412. Reduce from 4 to 3 square matchsticks

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In the figure above 12 matchsticks are used to form 4 square matchsticks. Make sure to understand that A plus B is exactly 1 square matchstick.

Your challenge now is to rearrange the 12 matchsticks to form 3 square matchsticks. All matchsticks must be used and all matchsticks must be flat on the surface.

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It should be clear that A plus B is 1 square matchstick as well as C plus D.

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