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[" 9.Let "a" and "b" be the coefficient ...

[" 9.Let "a" and "b" be the coefficient of "x^(3)" in "(1+x+3x^(2)+4x^(3))^(4)" and "(1+x+3x^(2)+4x^(3)+5x^(4))^(4)" ,"],[" respectively.Find the value of "(a-b)" ."]

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