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Determine the coefficient of $x$ in the expansion of $(x + \frac{2}{x^2})^7$.
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: “Correctly uses ${}^7C_2 x^5 \left(\frac{2}{x^2}\right)^2$ and reaches the final answer” …
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