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[" Let "P(m)" stand for "^(m)P(m)" ,then...

[" Let "P_(m)" stand for "^(m)P_(m)" ,then,"],[1+P_(1)+2P_(2)+3P_(3)+......+n.P_(n)" is equal to "],[[" (1) "(n-1)!," (2) "n!],[" (3) "(n+1)!-1," (4) "(n+1)!]]

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