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Find the constant value of $p$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
In the expansion of $(px^2 + \frac{4}{p}x)^5$, the coefficient of $x^7$ equals $1280$.
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This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Recognises the suitable binomial coefficients, such as ${5\choose3}$ or ${5\choose2}$” …
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