Răspuns :

ThatOneRandomGuyid

a) A={x∈N|4<x<9}

4<x<9 => x = {5,6,7,8}

A= {5,6,7,8}

b) Card(A) = 4 (numarul de elemente pe care le cuprinde multimea)

c) {5,6,7} ⊂ A

(  {5,7,8} ⊂ A ; {5,6,8} ⊂ A ; {6,7,8} ⊂ A  )

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