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Find the coefficient attached to $x$ in the expansion of $\left(\frac{x}{3} + \frac{9}{x^2}\right)^7$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Accurate algebraic rearrangement to obtain the required term” …
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