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Question Number 63836 by gunawan last updated on 10/Jul/19

$$\mathrm{If}n\in N,\mathrm{then}\mathrm{the}\mathrm{sum}\mathrm{of}\mathrm{the}\mathrm{coefficients}$$$$\mathrm{in}\mathrm{the}\mathrm{expansion}\mathrm{of}\mathrm{the}\mathrm{binomial}$$$${(5x-4y)}^n\mathrm{is}$$

Commented by kaivan.ahmadi last updated on 10/Jul/19

$$x=y=1\Rightarrow {(5-4)}^n=1$$

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