question_answer

If \[\frac{x-4}{{{x}^{2}}-5x+6}\]  can be expanded in the ascending powers of x, then the coefficient of \[{{x}^{3}}\]is

A)  \[-\frac{73}{648}\]       

B)  \[\frac{73}{648}\]

C)  \[\frac{71}{648}\]                    

D)  \[-\frac{71}{648}\]