Răspuns :
Multiplii lui 3: 18,21,24,27,30,33,36,39,42,45,48,51,54,57,60. (Inmultim cu 3 numerele 6,7,8,9....20.)
Multiplii lui 5: 20,25,30,35,40,45,50,55,60. (Inmultim cu 5 numerele 4,5,6...12.)
Multiplii lui 3: 18,21,24,27,30,33,36,39,42,45,48,51,54,57,60. (Inmultim cu 3 numerele 6,7,8,9....20.)
Multiplii lui 5: 20,25,30,35,40,45,50,55,60. (Inmultim cu 5 numerele 4,5,6...12.)