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  4. If A and B are non-empty sets and either A or B is infinite, then A × B is ...X... Here, X refers to

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Q. If $A$ and $B$ are non-empty sets and either $A$ or $B$ is infinite, then $A \times B$ is ...$X$... Here, $X$ refers to

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Solution:

If $A$ and $B$ are non-empty sets and either $A$ or $B$ is an infinite set, then $A \times B$ is also infinite.