Three numbers are drawn from {1, 2, 3, 4, 5, 6, 7} and placed in a row in the order drawn to form a three-digit number. What is the probability of the following. (Round your answers to three decimal places.) (a) The number is 454. (b) The first digit is 2, 5, or 7. (c) It is larger than 400. (d) It is less than 321.
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