Explicație pas cu pas:
a)100, 200, 300, 400, 500, 600, 700, 800, 900
b)800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900
c) n+11< 214 |-11
--> n<201
n= 100, 200
d)3n + 123 < 1211 | -123
3n < 1088 |:3
n < 1088/3 ~ 362
-> 100, 200, 300
