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3 May, 16:36

What is the coefficient of the fourth term in the expansion of (a-4b) ^9?

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  1. 3 May, 16:39
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    a9 - 36 a8 b + 576 a7 b2 - 5376 a6 b3 + 32256 a5 b4 - 129024 a4 b5 + 344064 a3 b6 - 589824 a2 b7 + 589824a b8 - 262144 b 9
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