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Counting number of Derangements ! | Reply
I was reading this tutorial and I am facing problems to understand the counting of Derangements by the sieve principle (i am getting confused with the notations basically).It would be nice if someone explained this again here ;)

Thanks in advance!
Re: Counting number of Derangements ! (response to post by RosyIsh) | Reply
Try Inclusion Exclusion Principle.
There is some DIV1 500 , I don't remember you can try to find it using Google.
EDIT : Here is the problem