3. Let Si = {A, B, C, D, E}, S2 = {H, F, D, B}, S3 %3D {В, Е, Н, К}. (a) Write a set expression that represents the collection of elements in S1 or S2, but not S3, using standard set operations from pages 14–15 in the course notes (e.g., the expression S1 n S2 represents the collection of elements in S1 and S2). (b) Then, list every element that belongs to S1 or S2, but not S3, using set notation (i.e., \{…\}).

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