If event B is a subset of the sample space S, hence the area represented by the shaded part is complement of B
Set theory
The set is a collection of members and things.
According to the venn diagram given, the whole set including the set B is the universal set.
The part not shaded is not part of the universal set, hence, we name them the complement of a set.
If event B is a subset of the sample space S, hence the area represented by the shaded part is complement of B
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