Question
How many distinct permutations are there of the form$$\left(\begin{array}{cccc}1 & 2 & \ldots & n-1 \\\psi(1) & \psi(2) & \ldots & \psi(n-1)\end{array}\right) ?$$
Step 1
In this case, there is only one element, so there is only one permutation. Show more…
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