🌐EnglishEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsTürkçeРусскийالعربيةفارسیไทย中文EntityQ32918· pop 19· linked from 51 articlesthree utilities problemAlso known as three cottages problem, water, gas, and electricity, utility graphmathematical problemWikidata factsImage3 utilities problem proof.svgSources (1)wikidata.orgvia Wikidata · CC0Available in 18 languagesEspañolFrançais中文РусскийPortuguêsItalianoالعربيةArmenianCzechGalicianConnectionsminor graphEntitystructural rigidityEntityCategoriesMathematical puzzlesTopological graph theoryUnsolvable puzzles