Suppose A1, A2, . . . have the same cardinality as R. (There are denumerably many of them.) What is the cardinality of A1 ×A2 ×···

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Suppose A1, A2, . . . have the same cardinality as R. (There are denumerably many of them.) What is the cardinality of A1 ×A2 ×···?

Not really sure how to approach this. Any help is greatly appreciated.