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Q2. Set A has 6 elements. Four subsets P,Q,R,S are chosen from A randomly. Whats the probability that P ∩ Q ∩ R ∩ S= null set?

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a) (14/16)⁶   b) (15/16)⁶  c) (3/4)⁶   d) (1/2)⁶  e) None

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