Misal A= {1,2,3} dan B = {2,1,5},maka (A potongan B)-A adalah?

A= {1,2,3} dan B = {2,1,5}
A Π B = {1,2}
A Π B – A = { }

A POTONGAN B = {1,2}
(A POTONGAN B) – A = {1,2} – {1,2,3} = { } HIMPUNAN KOSONG