If \( |x|1 \), then find the coefficient of \( x^{n} \) in the expansion of \( \left(1+2 x+3 x^{... VIDEO
If \( |x|1 \), then find the coefficient of \( x^{n} \) in the expansion of \( \left(1+2 x+3 x^{2}+4 x^{3}+\cdots\right)^{1 / 2} \)
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