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If P={1,2,5,7,9}, Q={2,3,5,9,11}, R={3,4...

If P={1,2,5,7,9}, Q={2,3,5,9,11}, R={3,4,6,7,9} and S={2,3,4,5,8} then find
(i) `(P cup Q) cup R)` (ii) `(P cap Q) cap S` (iii) `(Q cap S) cap R`

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