Aspire Faculty ID #10220 · Topic: NIMCET 2015 · Just now
NIMCET 2015

Let $\bar{P}$ and $\bar{Q}$ denote the complements of two sets P and Q. Then the set $(P-Q)\cup (Q-P) \cup (P \cap Q)$ is

Solution

Expression: \((P - Q) \cup (Q - P) \cup (P \cap Q)\)

Recall: \(P - Q = P \cap \bar{Q}\) and \(Q - P = Q \cap \bar{P}\).

Thus the union consists of three mutually exclusive parts:

  • Elements only in \(P\): \(P \cap \bar{Q}\)
  • Elements only in \(Q\): \(Q \cap \bar{P}\)
  • Elements in both: \(P \cap Q\)

The union of these three pieces is precisely all elements that are in \(P\) or \(Q\):

\((P - Q) \cup (Q - P) \cup (P \cap Q) = P \cup Q\).

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