I want to find $^nC_r \bmod m$, and see this relation that $n!^{-1}\cdot n \equiv (n - 1)^{-1} \pmod{m}$, but didn't get it.
2026-04-13 05:03:46.1776056626
Please explain how $n!^{-1} * n \equiv (n - 1)!^{-1} \pmod{m}$
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