If $P (10, r) = 5040$ , then r =

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answer is B.

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Detailed Solution

$\begin{array}{l} \frac{⌊ 10}{⌊ 10 - r} = 5040 = \frac{10.9.8.7 \underline{6}}{⌊ 6} = \frac{⌊ 10}{⌊ 6} \\ \Rightarrow 10 - r = 6 \Rightarrow r = 4 \end{array}$

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