A={x:x=2•n+3,n€N,n≤12} va rog ajutati-ma

Răspuns :

A={x|x=2•n+3,n€N,n≤12}
A={3;5;7;9;11}
as simple as that!
pt ca 2*0+3=3≤12
2*1+3=5≤12
................
2*4+3=11≤12