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[" 3.If "^(n)P(5)=20.^(n)P(3)" Then "n=?...

[" 3.If "^(n)P_(5)=20.^(n)P_(3)" Then "n=?],[[" (a) "-1," (b) "7],[" (c) "6," (d) "8],[" (c) "18" ."18" ."," (d) "8]]

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