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[" The coefficient of "x^(n)y^(n)" in th...

[" The coefficient of "x^(n)y^(n)" in the expansion of "{(1+x)],[(x+y)}^(n)" is - "],[qquad sum_(" (a) ")^(n)C_(r)^(2)quad sum_(r=0)^(n)C_(r)^(3)sum_(" (b) ")^(n)sum_(r+s=0)^(n)C_(r)^(n)C_(s)^(2)]

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