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Find the coefficient of x^(25) in expans...

Find the coefficient of `x^(25)` in expansion of expression `sum_(r=0)^(50)^(50)C_r(2x-3)^r(2-x)^(50-r)` .

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  3. Find the coefficient of x^(25) in expansion of expression sum(r=0)^(50...

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  4. If the sum of the coefficients of the first, second, and third terms ...

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  7. Prove that ^m C1^n Cm-^m C2^(2n)Cm+^m C3^(3n)Cm-=(-1)^(m-1)n^mdot

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  9. Find the sum sum(r=0)^n^(n+r)Cr .

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