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

 Jul 21, 2020
edited by Guest  Jul 21, 2020
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128 y^7 - 2240 y^6 + 16800 y^5 - 70,000 y^4 + 175000 y^3 - 262500 y^2 + 218750 y - 78125
(8 terms)

 Jul 21, 2020

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