Dearrangement Formula | Permutations of Alike Objects

Here you will learn dearrangement formula and permutation of alike objects with example. Letโ€™s begin โ€“ Dearrangement Formula There are n letters and n corresponding envelopes. The number of ways in which letters can be placed in the envelopes (one letter in each envelope) so that no letter is placed in correct envelope is n![1 โ€ฆ

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