A) \[\frac{462{{a}^{6}}}{{{b}^{5}}}\]
B) \[\frac{462{{a}^{5}}}{{{b}^{6}}}\]
C) \[\frac{-462{{a}^{5}}}{{{b}^{6}}}\]
D) \[\frac{-462{{a}^{6}}}{{{b}^{5}}}\]
Correct Answer: B
Solution :
For number of term, \[(11-r)(1)+r(-2)=-7\Rightarrow 11-r-2r=-7\]\[\Rightarrow r=6\] Thus coefficient of x-7 is \[^{11}{{C}_{6}}{{(a)}^{5}}{{\left( -\frac{1}{b} \right)}^{6}}=\frac{462}{{{b}^{6}}}{{a}^{5}}\]You need to login to perform this action.
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