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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-4)/(x^(2)-5x+6)` specifying the region in which the expansion is valid.

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The correct Answer is:
Coefficient of `x^(n)=(1)/(3^(n+1))-(1)/(2^(n))`
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