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

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Question:If set A X B=B X A then which of the following sets may satisfy?

1.A={1, 2, 3}, B={1, 2, 3, 4}

2.A={1, 2}, B={2, 1}

3.A={1, 2, 3}, B={2, 3, 4}

4.None of the mentioned

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  1. If set A X B=B X A then which of the following sets may satisfy?
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