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[" 13.The total number of five-digit num...

[" 13.The total number of five-digit numbers of different digits "],[" in which the digit in the middle is the largest is "],[[" (1) "sum_(n=4)^(9)nP_(4)," (2) "33(3!)],[" (3) "30(3!)," (4) "sum_(n=3)^(8)n*^(n)P_(3)]]

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