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Find the number of all onto functions from the set `{1, 2, 3, , n)`to itself. |
Answer» The number of all onto functions from the set { 1, 2, 3, ... , n} to itself will be equal to number of permutations of 1, 2, 3 , .. , n i.e.,`""^(n)P_n = lfloor n.` | |