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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. In group questions, you can add the two groups which represent "either" and subtract
the group which represents "both" to get a total number of items in the two sets.
If, in a certain school, 20 students play soccer, 10 play basketball,
and 7 play both, how many students play basketball, soccer or both?
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