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 Counting number of Derangements ! | Reply Hi, 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 http://www.topcoder.com/stat?c=problem_statement&pm=2013
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