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Derangement and Exclusion-Inclusion Principle. (1 Viewer)

I read many articles on the proof of derangement formula (based on Inclusion-Exclusion) but I couldn't understand this.Please help me. The formula is here: http://upload.wikimedia.org/math/1/9/2/1922f4c5da0db857bad09d1b352e7088.png
I only know the Inclusion-Exclusion based proof with an example

Last edited: Sep 12, 2014

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