5.2.2

Sets

Test yourself

Sets of Objects

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Sets

  • Sets are collections of objects.
  • The objects in a set are called its elements.
  • A set is written using curly brackets:
    • {2,3,4} is the set containing 2,3,4
    • {positive even numbers below 5} = {2,4}
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Universal set

  • The symbol ξ is used for the universal set: the set that contains everything.
  • On a Venn diagram, ξ is everything inside the rectangle.
  • The "complement of a set A" is written as A’
    • It is the set of all the things that aren’t in A.

Jump to other topics

1Number

1.1Place Value

1.2Factors & Multiples

1.3Operations

1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units

1.7Accuracy

2Algebra

3Ratio, Proportion & Rates of Change

4Geometry & Measures

5Probability

6Statistics

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