Ex 6 va rog mult dau coroana

Răspuns:
A U B={m,n,p,q,r}
A={m,p,r}
B={n,p,q}
A U intors B={n,r}
A={m,r,q,p}
B={n,m,q,p}
A-B={r}
A={m,q,r,n,p}
B=