If set A X B=B X A then which of the following sets may satisfy?(a) A={1, 2, 3}, B={1, 2, 3, 4}(b) A={1, 2}, B={2, 1}(c) A={1, 2, 3}, B={2, 3, 4}(d) None of the mentionedI had been asked this question in quiz.This is a very interesting question from Cartesian Product of Sets topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

If set A X B=B X A then which of the following sets may satisfy?(a) A=

1.	If set A X B=B X A then which of the following sets may satisfy?(a) A={1, 2, 3}, B={1, 2, 3, 4}(b) A={1, 2}, B={2, 1}(c) A={1, 2, 3}, B={2, 3, 4}(d) None of the mentionedI had been asked this question in quiz.This is a very interesting question from Cartesian Product of Sets topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
Answer» RIGHT ANSWER is (B) A={1, 2}, B={2, 1} To explain: For set A X B = B X A, this is possible only when set A = B.

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