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Find the coefficient of x^(n) in the pow...

Find the coefficient of `x^(n)` in the power series expansion of `(x)/((x-1)^(2)(x-2))` specifying the region in which the expansion is valid.

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The correct Answer is:
`:."Coefficient of "x^(n)=2(1)-(n+1)-((1)/(2^(n)))=2-n-1-(1)/(2^(n))=1-n-(1)/(2^(n)).`
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