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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

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 It is less than 426.

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