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Hello! I am assuming nPr means "n permutation r". Unfortunately, SageMath doesn't have a command for that purpose. However, if you remember that

$$nPr = \frac{n!}{(n-r)!} = \binom{n}{r}r!,$$

you can make something like this:

perm(n, r) = factorial(n) / factorial(n - r)

or even:

perm(n, r) = binomial(n, r) * factorial(r)

Hope this helps!