Question

fie multimea A=(1,x,2,3)  determinati valoarea lui x stind ca: AU(1,2,3,4,5,6,)=(1,2,3,4,5,6,7,).



                                                    paratezele rotunde sunt acolade

Answer 1

{1,x,2,3}u{1,2,3,4,5,6}={1,2,3,4,5,6,7}
x=7