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" 73.Let "f(n)=sum(r=1)^(n)[r^(2)(^(n)C(...

" 73.Let "f(n)=sum_(r=1)^(n)[r^(2)(^(n)C_(r)-^(n)C_(r-1))+(2r+1)(^(n)C_(r))]," then "f(30)" is "

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