Numere complexe:
Determinati cardinalul multimilor [tex]M_{2}[/tex]∪[tex]M_{4}[/tex] si [tex]M_{12}[/tex]∪[tex]M_{16}[/tex] daca [tex]M_{n} =[z[/tex]∈ C | [tex]z^{n} =1][/tex], n∈ N