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Let P be the set of all subsets of a giv...

Let P be the set of all subsets of a given set X. Show that `uu:P xx P to P ` given by ` (A,B) to A uuB and nn:PxxP to P` given by `(A,B) to A nnB` are binary operations on the set P.

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The correct Answer is:
`phi, A^(-1)=A`
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