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[" 7.If "quad " (C) "4],[[" If "^(n)P(5)...

[" 7.If "quad " (C) "4],[[" If "^(n)P_(5),=20.^(n)P_(3)," then "n=],[[" a) "4," (b) "8],[" (c) "6," (d) "7]]]

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