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Find the sum of the series nC0 x^(3n) + ...

Find the sum of the series `nC_0 x^(3n) + (nC_1) /2 x^(3(n-1)) (3-x^3) +(nC_2 )/3 x^(3(n-2)) (3-x^3)^2+.......+(nC_n)/(n+1) (3-x^3)^n `

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