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1 A family of k members is planning to have a birthday party for a two year old baby Each member buys a gift in

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1 A family of k members is planning to have a birthday party for a two year old baby Each member buys a gift in a department store with n items n k Assume that each buy their gift independent of each other a Let Pk P there is the same gift and A be the event that all k gifts are different so that Pk 1 P A Find P AK

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