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Question

Give examples to show that
AA=A and AA=A

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Solution

Let A=1,2,3,4,5
AA={1,2,3,4,5}{1,2,3,4,5}
={1,2,3,4,5}=A
AA={1,2,3,4,5}{1,2,3,4,5}
={1,2,3,4,5}=A
So, AA=A
AA=A

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