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gasiti cifrele x si y astfel incat numarul21x7y sa fie divizibil cu 3 si 5

Răspuns :

21x7y divizibil cu 5 21175,21275,21375,21475,21575,21675,21775,21785,21795,21075,21170,21270,221370,21470,21570,21670,21770,21870,21970,21070. 21x7y divizibile cu 3 21172,21271,21372,21273,21474,21570,21075,21276,21672,21177,21771,21378,21873.