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Determine the coefficient of $x$ in the expansion of $(\frac{1}{x} + 3x^2)^5$.
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: “Binomial expansion used or expansion term $5 \cdot C_2 \left(\frac{1}{x}\right)^3 (3x^2)^2$” …
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