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" If "x+y=1" then "sum(r=0)^(n)r.^(n)C(r...

" If "x+y=1" then "sum_(r=0)^(n)r.^(n)C_(r)x^(r)*y^(n-t)

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If x+y=1 , then sum_(r=0)^(n)r^(2)""^(n)C_(r)x^(r)y^(n-r) equals:

If x+y=1, then sum_(r-0)^(n)rnC_(r)x^(r)y^(n-r) equals

If x+y=1, prove that sum_(r=0)^(n)nC_(r)x^(r)y^(n-r)

If x + y = 1 , prove that sum_(r=0)^(n) r""^(n)C_(r) x^(r ) y^(n-r) = nx .

If x + y = 1 , prove that sum_(r=0)^(n) r""^(n)C_(r) x^(r ) y^(n-r) = nx .