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Math Help - Expanding Binomials

  1. #1
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    Expanding Binomials

    Please help quick!!
    Find the coefficient of in the expansion of
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  2. #2
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    Re: Expanding Binomials

    Hey rikki397.

    Hint: What given r satisfies for nCr (5x^2)^(n-r) * (-4/x)^r where (5x^2)^(n-r)*(-4/x)^r = a/x where a is a constant number?
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