Probability that none of questions in second set are same

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A computer package selects at random, and without replacement, three multiple choice questions for you from a bank of 10 questions. Later you decide to have another attempt, so it again chooses three questions at random and without replacement. What is the probability that none of the questions in the second set are the same as any of those in the first set? What must the computer do for there to be no questions in common?

Reference no: EM13127131

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