elementele mulțimi {x|€N3<x<5}sunt?

Răspuns :

[tex]M=\left\{x\:| \: x \: \in \: \mathbb{N},3 < x<5\right\}[/tex]

[tex]3 < x < 5 = (3,5)[/tex]

[tex]x \: \in \: \mathbb{N} => x \: \in \: \left\{4 \right \}[/tex]

[tex]M=\left\{4 \right \}[/tex]