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Determine the coefficient of $\frac{1}{x^3}$ in the expansion of $(x - \frac{2}{x})^7$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The correct term $7C5\,x^2(-2/x)^5$ is selected (this may appear in an expansion; allow $7C2$).” …
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