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((n!)^3/(3n)!)((3(n+1))!/(((n+1)!)^3))-(3(n+1)(3n+2)(3n+1))/((n+1)^3)=
((n!)^3/(3n)!)((3(n+1))!/(((n+1)!)^3))-(3(n+1)(3n+2)(3n+1))/((n+1)^3)=
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