Răspuns:
a) 7891, 7892, 7893, 7894, 7895, 7896, 7897, 7898
b) 3066, 3067, 3068, 3069, 3070, 3071
c) 5699, 5698, 5697, 5696, 5695, 5694
d) 4003, 4002, 4001, 4000, 3999, 3998, 3997, 3996
e) 8280, 8281, 8282, 8283, 8284
f) 9999, 9998, 9997, 9996, 9995, 9994.