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If AuuB = AnnB, prove that A=B...

If `AuuB = AnnB`, prove that `A=B`

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If A, B are two sets, prove that AuuB=(A-B)uu(B-A)uu(AnnB) . Hence or otherwise prove that n(AuuB)=n(A)+n(B)-n(AnnB) where, n(A) denotes the number of elements in A.

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