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A is a set containing n elements. A subs...

A is a set containing n elements. A subset P of A is chosen. The set A reconstructeed by replacing the elements of P. A subset Q of A is again chosen. The number of ways of chosen P and Q so that `PnnQ=phi` is _____________.

A

`2^(2n- 2n)C_(n)`

B

`2^(n)`

C

`3^(n)-1`

D

`3^(n)`

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