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Prove that sum(r=1)^(m-1)(2r^2-r(m-2)+1)...

Prove that `sum_(r=1)^(m-1)(2r^2-r(m-2)+1)/((m-r)^m C_r)=m-1/mdot`

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CENGAGE PUBLICATION-BINOMIAL THEOREM-All Questions
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  3. Prove that sum(r=1)^(m-1)(2r^2-r(m-2)+1)/((m-r)^m Cr)=m-1/mdot

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  4. Find the coefficients of x^(50) in the expression (1+x)^(1000)+x(1+x)^...

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