[tex]\overline{4a6b}\vdots18\ daca\ \overline{4a6b}\vdots2\ si\ \overline{4a6b}\vdots9\\
\overline{4a6b}\vdots2=\ \textgreater \ b\in\{0,2,4,6,8\}\\
\ \overline{4a6b}\vdots9=\ \textgreater \ \ daca\ (4+a+6+b)\vdots9=\ \textgreater \ (10+a+b)\vdots9\\
1)b=0=\ \textgreater \ a=8\\
2)b=2=\ \textgreater \ a=6\\
3)b=4=\ \textgreater \ a=4\\
4)b=6=\ \textgreater \ a=2\\
5)b=8=\ \textgreater \ a=0[/tex]
