a) 1000
b) 1) 1302, 1320, 1230, 1032
2) 2374, 2734, 3724, 3742, 7234, 7324, 7342, 4372, 4732
3) 3496, 3694, 3946, 3964, 4936, 4396, 6394, 6934, 9346, 9364, 9436, 9634
4) 1254, 1452, 1524, 1542, 2154, 2514, 4152, 4512, 5124, 5142, 5412, 5214
5) 2350, 2530, 3052, 3250, 3502, 3520, 5032, 5230, 5302, 5320
6)1296, 1692, 1926, 1962, 2196, 2916, 6192, 6912, 9126, 9162, 9212, 9216
sper ca te-am aiutat