n(aubuc)=n(a)+n(b)+n(c)-n(a∩b)-n(a∩c)-n(b∩c)+n(a∩b∩c) proof

Описание к видео n(aubuc)=n(a)+n(b)+n(c)-n(a∩b)-n(a∩c)-n(b∩c)+n(a∩b∩c) proof

Proof of n(aubuc)=n(a)+n(b)+n(c)-n(a∩b)-n(a∩c)-n(b∩c)+n(a∩b∩c) by Venn Diagram, Union of 3 Sets.

In this lecture a very important identity on cardinality of three sets have been proved which is n(AUBUC)=n(A)+n(B)+n(C)-n(A∩B)-n(A∩C)-n(B∩C)+n(A∩B∩C), where A, B and C are finite sets. This identity might be helpful to solve a numerous of problems base on cardinality of sets.

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