a). 123a divizibil cu 3 ={1233,1236,1239}
b). 25ab divizibil cu 9={2509,2518,2527,2536,2545,2554,2563, 2572,2581,2590}
c). 63bc divizibil cu 9={6309,6318,6327,6336,6345,6354,6363, 6372,6381,6390}
63bc divizibil cu 10= {6300,6310,6320,6330,6340,6350,6360,6370,6380,6390}
