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Find the coefficient of x^(-5) in ""^...

Find the coefficient of `x^(-5)` in `""^(n)C_(0)-""^(n)C_(1) ((2x-1)/(x))+""^(n)C_(2)((2x-1)/(x))^(2)-....+ (-1)^(n) ((2x-1)/(x))^(n)`

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Verified by Experts

The correct Answer is:
`(-1)^(n-5)(lfloorn)/(lfloorn-5 lfloor5)`
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