Question 307812
Find the coefficient of b^5 in the expansion of (a-2b)^8 
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8C3(a^3)(-2b)^5
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= [(8*7*6)/(1*2*3)](a^3)(-32)b^5
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= 56*(-32)a^3b^5
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= -1792a^3b^5
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Cheers,
Stan H.