Răspuns: [tex]\bf 43xy\in\{4302,4320,4311\}[/tex]
Explicație pas cu pas:
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[tex]\bf \overline{43xy} \: \vdots\: 3\Leftrightarrow \text {\bf daca suma cifrelor se divide cu 3 }[/tex]
[tex]\bf x,y - cifre \implies x, y \in \{0,1,2,3,4,5,6,7,8,9 \}[/tex]
[tex]\bf 4+3+x+y =( 7+x+y) \in M_{3}\implies( 7+x+y) \in \{9 \}[/tex]
[tex]\bf x+y = 2\implies (x,y) \in \{(0,2);(2,0);(1,1) \}\implies\boxed{\bf 43xy\in\{4302,4320,4311\}}[/tex]
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