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If P X Q is an empty set then which of the following is a null set?(a) only P(b) only Q(c) either P or Q(d) both P and QThis question was posed to me during an interview.I'd like to ask this question from Cartesian Product of Sets topic in chapter Relations and Functions of Mathematics – Class 11

Answer»

Right option is (C) either P or Q

To explain: If either set P or set Q is a NULL set then P X Q is an EMPTY set.

i.e. if P is Φ or Q is Φ then P X Q = Φ.



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