1a. 9999
b. 10000
c. 102346
d.989898
e. 9876
f. 13579
g. 9746853
2.a 36,37,38,39,40
b. 96,98,100,102,104,106
c. 997,999,1001,1003,1005,1007,1009
3a. 9,11,13,.....19
b.12,15,18.....27
c.5 la puterea4,5 la puterea 5,5 la puterea 6,.....5la puterea 9
d. 63,127,255....2047