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# PLZ HELP

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Find the coefficient of $y^4$ in the expansion of $(2y - 5)^7.$

Jul 7, 2020

#1
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Find the coefficient of $y^4$ in the expansion of $(2y - 5)^7.$

$$\begin{pmatrix} 7\\ 4 \end{pmatrix} (2y)^4(-5)^3$$

you can finish it

Jul 7, 2020