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[" 14.The number of numbers formed by ni...

[" 14.The number of numbers formed by nine non-zero digits "],[" such that all the digits in the first four places are less than "],[" the digit in the middle and all the digits in the last four "],[" places are greater than that in the middle is "],[[" (1) "2(4!)," (2) "3(7!)/2," (3) "2(7!)," (4) "^(4)P_(4)times^(4)P_(4)]]

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The number of nine nonzero digits such that all the digits in the first four places are less than the digit in the middle and all the digits in the last four places are greater than that in the middle is

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