The topic is somewhat confusing…
Can you suggest some good resources for Inclusion Exclusion principles and in which type of problems we have to use Inclusion and Exclusion ??
The video is very confusing
have a look at dearrangement theorem, it is a nice application of inclusion and exclusion principle.
Or you could try yourself. Find the no the ways to place n balls to n boxes. such that i’th box does not get i’th ball.
If you have any doubt in dearrangement theorem, reply to this thread and i’ll help you with it.
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