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[" 2.The number "916238457" is an exampl...

[" 2.The number "916238457" is an example of a nine-digit "],[" number which contains each of the digit "1" to "9" exactly "],[" once.It also has the property that the digits "1" to "5" occur in "],[" their natural order,while the digits "1" to "6" do not.Find the "],[" number of such numbers."]

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