Question: 27. Suppose that three numbers are selected one by one, at random and without replacement from the set of numbers {1, 2, 3, . .

27. Suppose that three numbers are selected one by one, at random and without replacement from the set of numbers {1, 2, 3, . . . , n}. What is the probability that the third number falls between the first two if the first number is smaller than the second?

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