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Sets
A Set describes a group of items called an element or a member. Sets are usually marked off by these types of brackets {}. All the mammals of the world may be a set, of which dogs and cats are members, but lizards are a member of the reptiles group.
In mathematical terms, you can have a set of odd numbers less than 10 such as {1, 3, 5, 7,9} and a set of prime numbers less than 10 {2, 3, 5, 7} and the overlap is {3, 5, 7}.
Overlapping Sets
When
a question relates to overlapping groups, try diagramming the problem
with overlapping circles. This will make it easy to account for the
overlap.
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