Sobre \mathbb{Z}_{28} considerau la relació d'equivalència [x]\sim [y] si...
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Sobre 
\mathbb{Z}_{28} considerau la relació d'equivalència ![[x]\sim [y]](https://firebasestorage.googleapis.com/v0/b/crowdvns.appspot.com/o/files_v4%2Fad_uib_es%2Fquestions%2Fb7c68e0dcbdbd60b3b274b470274d447ece14b3e795db1f835b0ad32cbe102ca%2Fresources%2F4dd9779869d8e067b29d44a58d5a7f407a7ecd8d8a5423e8eda6b8b8514668c5?alt=media)
[x]\sim [y] si, i només si, ![[4][x]=[4][y]](https://firebasestorage.googleapis.com/v0/b/crowdvns.appspot.com/o/files_v4%2Fad_uib_es%2Fquestions%2Fb7c68e0dcbdbd60b3b274b470274d447ece14b3e795db1f835b0ad32cbe102ca%2Fresources%2Fa2180db406c4d79dd4d4735037eb9299d4c2ee509212c401ba0462ff07bf4d69?alt=media)
[4][x]=[4][y]. Quants elements té la classe d'equivalència de l'element [2]? El resultat ha de ser un nombre natural i res més.
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