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Aflati elementele urmatoarelor multimi a={x|x€N,x+1|18

Răspuns :

[tex]x+1|18[/tex]
[tex]x+1\in\{1,2,3,6,9,18\}[/tex]
[tex]x\in\{0,1,2,5,8,17\}[/tex]