Counting & ProbabilityHardInclusion–Exclusion, Derangements & Pigeonhole ShareInclusion--Exclusion, Derangements & Pigeonhole · Hard problemHow many permutations of {1,2,…,6}\{1,2,\dots,6\}{1,2,…,6} have at least one fixed point?Check Show answer Walk through it step by step Practice more like this Review this concept