1.

In the expansion of \[{{\left( \frac{a}{x}+bx \right)}^{12}}\],the coefficient of x-10 will be

A. \[12{{a}^{11}}\]
B. \[12{{b}^{11}}a\]
C. \[12{{a}^{11}}b\]
D. \[12{{a}^{11}}{{b}^{11}}\]
Answer» D. \[12{{a}^{11}}{{b}^{11}}\]


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