If $P, Q, R$ are subsets of the universal set U, then $$(P\cap Q\cap R) \cup (P^c \cap Q \cap R) \cup Q^c \cup R^c$$ is
Can we treat these like Boolean expression and solve?
Like PQR + P'QR + Q' + R'. and minimise this.
Is this method always correct?
so option d
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