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Supply all three houses with water, electricity and gas without crossing any lines. Hard, but possible! - iFunny Brazil
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The Three Utilities Problem. An Introduction to Euler's Formula. | by Dhruv GOSWAMI | maths@dover | Medium
The three houses and the three utilities | It's an old puzzle. You have 3 houses & 3 utilities (gas, water & electricity). Can you join each house to each utility without
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