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Find the coefficient of $x^2$ when $(2 - 5x)(1 + 3x)^{10}$ is expanded.
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: “The second term in the expansion of $(1+3x)^{10}$ is correctly $30x$.” …
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