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Let X be a set containing n elements. Tw...

Let X be a set containing n elements. Two subsets A and B of X are chosen at random. Find the probability that `AcupB=X

A

`(.^(2n)C_(n))/(2^(2n))`

B

`((3)/(4))^(n)`

C

`(1)/(.^(2n)C_(n))`

D

none of these

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The correct Answer is:
B
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