Question

Write Inclusion -Exclusion principle for four sets.

Answer 1

Proofs class homework question - It doesn't ask for us to prove, derive, or even illustrate the inclusion/exclusion principle - Just to jot it down.

We're learning about sets and inclusivity/exclusivity (evidently) I've got the inclusion/exclusion principle for three sets down to 2 sets. I'm sort a bit confused as to how I'd go about getting 4. Is there a systematic/elementary manner to prove it or is this more to do with general knowledge and research?

Answer 2

Just go here

https://math.stackexchange.com/questions/688019/what-is-the-inclusion-exclusion-principle-for-4-sets