Răspuns :
1. 20........29
40.......49
60.......69
80.....89
2. 21,43,54,65,87,
3. 11,22,33,44,55,66,77,88,99
4. 13,24,35,46,57,68,79
40.......49
60.......69
80.....89
2. 21,43,54,65,87,
3. 11,22,33,44,55,66,77,88,99
4. 13,24,35,46,57,68,79
1)10,12,14,16...98
2)21.43.65.87
3)11,22,33,44,55,66,77,88,99
4)13,24,35,46,57,68,79
2)21.43.65.87
3)11,22,33,44,55,66,77,88,99
4)13,24,35,46,57,68,79