if A = { 1,2,3,4,} then the number of element in A×A is.
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A×A ={(1,1), (1,2), (1,3), (1,4), (2,1), (2,2), (2,3), (2,4), (3,1),(3,2), (3,3), (3,4), (4,1), (4,2), (4,3), (4,4). This is your answer.
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