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[" 9.If "^(4)P(r)=5040" then "(n,r)=,," ...

[" 9.If "^(4)P_(r)=5040" then "(n,r)=,," 1) "144],[" 9.If "^(n)P_(r)=5040" then "(n,r)=,(11,3)," 4) "(11,4)," 21.The lette "],[" 1) "(9,4)," 2) "(10,4)," 3) "(11,3)," 21.The lette "]

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