Question

Daca A={xapartine N|x divide -6} si B={x apartine N|x<10 si x divizor al lui 3} atunci A\B=?

Answer 1

x | -6
x-nr. natural
=>x apartine {1,2,3,6}
<=>A={1,2,3,6}

x<10
x | 3
x-nr. nat.
=> x apartine {1,3}
<=> B={1,3}
A\B={2,6}