Question 13 Marks
$(a+b x)(1-x)^6=3-20 x+c x^2+\ldots$, then find $a, b, c$.
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$\sqrt[4]{16.08}$
$\left(x^4-\frac{1}{x^3}\right)^{11}$
$\left(x^2+\frac{1}{x}\right)^7$
$\left(x-\frac{2}{x^2}\right)^{15}$
$\left(2 x+\frac{1}{3 x^2}\right)^9$
$x^{-20}$ in $\left(x^3-\frac{1}{2 x^2}\right)^{15}$
$x^{-3}$ in $\left(x-\frac{1}{2 x}\right)^5$
$x^9$ in $\left(\frac{1}{x}+x^2\right)^{18}$
$x^8$ in $\left(2 x^5-\frac{5}{x^3}\right)^8$
$x ^3$ in $\left(x^2+\frac{3 \sqrt{2}}{x}\right)^9$