Question

Determinati mulțimile:
A= {a | a apartine N,a | 10}

Answer 1

$A = \left \{ a \: | \: a \: \in \: \mathbb{N} \: ,a \: | \: 10 \right \}$

$a \: | \: 10 \: \:si\: \: a \: \in \: \mathbb{N} = > a \: \in \: D_{10_{+}}$

$D_{10_{+}} = \left \{ 1, 2 , 5, 10 \right \}$

$=>A=\left \{ 1, 2 , 5, 10 \right \}$