Twelve popular brands of beer are used in a blind taste study for consumer recognition. (A) If

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Twelve popular brands of beer are used in a blind taste study for consumer recognition. 

(A) If 4 distinct brands are chosen at random from the 12 and if a consumer is not allowed to repeat any answers, what is the probability that all 4 brands could be identified by just guessing? 

(B) If repeats are allowed in the 4 brands chosen at random from the 12 and if a consumer is allowed to repeat answers, what is the probability that all 4 brands are identified correctly by just guessing?

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