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[" 12.Prove that: "1.P(1,1)+2.P(2,2)+3.P...

[" 12.Prove that: "1.P(1,1)+2.P(2,2)+3.P(3,3)+...+n.P(n,n)=P(n+1,n+1)-1],[" 13.If "P(15,r-1):P(16,r-2)=3:4," find "r" ."]

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