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If A, B are two sets, prove that AuuB=(A...

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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