Răspuns :
Explicație pas cu pas:
M3 = {0,3,6 9,12,15,18,21,24,27,30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99,...}
u.c.(1)={21, 51, 81}
u.c.(2)={12, 42, 72}
u.c.(3)={3,33, 63, 93}
u.c.(0)={0, 30, 60, 90}
u.c.(7)={27, 57, 87}
u.c.(8)={18, 48, 78}