Find the sum of the coefficients in the expansion of $(1 + 2 x + 3 x^{2} + n x^{n})^{2} ˙$

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Find the sum of the coefficients in the expansion of

(1 + 2 x + 3 x^{2} + n x^{n})^{2} ˙

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Question Text

Find the sum of the coefficients in the expansion of

(1 + 2 x + 3 x^{2} + n x^{n})^{2} ˙

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