Question
How many 3-digit numbers are there, with distinct digits, with each digit odd?
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$\frac{(15-n) !}{(13-n) !}=12$
$\left|\begin{array}{ccc}1 & \log _x y & \log _x z \\ \log _y x & 1 & \log _y z \\ \log _2 x & \log _x y & 1\end{array}\right|=0$