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Derangements introduction

In this set we will try to find in how many ways can we arrange a set of different objects so that none of the objects go to their right place and try to derive a formula for it.

You may choose to read Principle of Inclusion and Exclusion

Note by Eddie The Head
3 years, 1 month ago

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Here is an easy proof of a formula for derangements click here Bogdan Simeonov · 3 years, 1 month ago

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