for any three sets P, Q and R, S is an element of  (P Δ Q) Δ R, then S may belong to
  1. Exactly one of P,Q and R if P, Q and R are disjoint sets
  2. At least one of P, Q and R but not in all three of them at the same time.
  3. Exactly two of P, Q and R
  4. Exactly one of P, Q and R or in all the three of them

Dear Student,
Please find below the solution to the asked query:

As we know thatPQ=A-BBA=AB-ABIf xAB then x belongs to exactly one of A and B but when we perofrmsymmetric difference for three sets then ABC also comes as part of ABCAbove is the Venn diagram of PQR Important, as you can see S belongs toexactly one of P,Q,R or all three of them.

Hope this information will clear your doubts about this topic.

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