Undoubtedly one of the easiest parts of CAT. Most of the formulae in this section can be deduced logically with little effort. The difficult part of the problem is translating the sentences into areas of the venn diagram. While solving, pay careful attention to phrases like and, or, not, only, in as these generally signify the relationship.
A is a subset of B if and only if all elements of A are already present in B
The set of all subsets of a set A is called the power set of A
The null set is a subset of all sets
If A=B, A $$\subset$$ B and B $$\subset$$ A
The similar concept applies for venn diagrams with three sets. Remember that,
To maximize overlap,
To minimize overlap,