The set of values of \( r \) simultaneously satisfying the system o...

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The set of values of \( r \) simultaneously satisfying the system of equations \( \mathrm{P}(5, \mathrm{r})=2 \cdot \mathrm{P}(6, \mathrm{r}-1) \) and \( 5 \cdot \mathrm{P}(4, \mathrm{r})=6 \cdot \mathrm{P}(5, \mathrm{r}-1) \), is
\( \mathrm{P} \)
(A) an empty set
(B) a singleton set
W
(C) a set consisting of two elements
(D) a set consisting of three elements.
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