Concept:Set difference removes elements common to both sets, then union combines the remaining elements.Explanation:A−B means elements in A but not in B.A−B={1,3,5}B−A means elements in B but not in A.B−A={8}Now take the union of both results:(A−B)∪(B−A)={1,3,5}∪{8}(A−B)∪(B−A)={1,3,5,8}Answer:{1,3,5,8}