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

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

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TopNewestHere is an easy proof of a formula for derangements click here – Bogdan Simeonov · 2 years, 8 months ago

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