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Question

If BA, then prove that (A×B)(B×A)=B×B

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Solution

Let (a, b) be an arbitrary element
(a,b)(A×B)(B×A)
(a,b)A×Band(ab)(B×A)
(aA,bB)and(aB,bA)
(aB,aB)
[since,BA;a,bBa,bA]
(a,b)B×B

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