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In a box of 12 videocassettes, 9 are blank. If 3 videocassettes are randomly selected without replacement, what is the probability that (a) all 3

In a box of 12 videocassettes, 9 are blank. If 3 videocassettes are randomly selected without replacement, what is the probability that (a) all 3 are blank? (b) at least 1 is blank?

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