If `P(9, r)=3024 ,\ ` find `rdot`

Explanation

To solve the problem where \( P(9, r) = 3024 \), we will follow these steps:

### Step 1: Understand the formula for permutations
The formula for permutations is given by:
\[ P(n, r) = \frac{n!}{(n - r)!} \]
In our case, we have \( n = 9 \) and we need to find \( r \).
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