[tex]\overline{7x2} \: \: \vdots \: \: 3 = >( 7 + x + 2) \: \: \vdots \: \: 3[/tex]
[tex] = > (9 + x) \: \: \vdots \: \: 3[/tex]
[tex]pt. \: x = 0 = > 9 + 0 = 9 \: \: \vdots \: \: 3[/tex]
[tex]pt. \: x = 9 = > 9 + 9 = 18 \: \: \vdots \: \: 3[/tex]
[tex]= > nr. \: cazuri \: favorabile = 2[/tex]
[tex]nr. \: cazuri \: posibile = card\left\{0,1,2,3,4,5,6,7,8,9\right\} = 10[/tex]
[tex]P = \frac{nr. \: cazuri \: favorabile}{nr. \: cazuri \: posibile} = \frac{2}{10} = \frac{1}{5} = 20\%[/tex]
