Question

Dado os conjuntos A= {x e n / 1<x c 4} B= {x e n / 2<x < 20}, então A-B?

Answer 1

A={2,3}
B={3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}
A-B={2}

Answer 2

A= {2,3}
B= {3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 }