Given sets are

A = {2, 4, 6, 8, 10} and B = {3, 6, 9, 12, 15}

A – B = {2, 4, 6, 8, 10} – {3, 6, 9, 12, 15}

= { , , , } ……. (1)

B – A = {3, 6, 9, 12, 15} – {2, 4, 6, 8, 10}

= {, , , } …….. (2)

From (1) and (2), A – B ≠ B – A