Răspuns:
a)
[tex]card(a) = 6[/tex]
b) B = {1, 2, 3, ...., 20}
[tex]card(b) = 20[/tex]
c) C = {1, 2, 3, 4, 6, 8, 12, 24}
[tex]card(c) = 8[/tex]
e) E = {0, 1, 2, ..., 89}
[tex]card(e) = 90[/tex]
