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

 Jul 7, 2020
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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

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