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Question Number 99429 by Ar Brandon last updated on 20/Jun/20

Solve for n in the equation  A_n ^(n−2) =56 {where A_n ^r =n−permution r}

$$\mathrm{Solve}\:\mathrm{for}\:\mathrm{n}\:\mathrm{in}\:\mathrm{the}\:\mathrm{equation} \\ $$$$\mathrm{A}_{\mathrm{n}} ^{\mathrm{n}−\mathrm{2}} =\mathrm{56}\:\left\{\mathrm{where}\:\mathrm{A}_{\mathrm{n}} ^{\mathrm{r}} =\mathrm{n}−\mathrm{permution}\:\mathrm{r}\right\} \\ $$

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