What is a set?
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What is a set?
A set is a collection of elements.
What symbol is the empty set represented by?
∅ represents the empty set (the set with no elements).
Define the term subset.
A subset is a set within another set.
E.g. If every element of set A is also in set B, then A is a subset of B, ().
What notation is used to represent the number of elements in a set?
E.g. The number of elements in set A.
n(A) represents the number of elements in set A.
What region in the Venn diagram represents the union of A and B, ?
The union of A and B, , is the set of all elements in A or B or both.
Which region represents A' on the Venn diagram below?
A' means not A, (A' is the complement of A) .
The regions not in the A circle, (everything outside A), represent A'.
True or False?
The region shaded below represents the intersection of A and B, .
False.
The region shown is the intersection of A, B and C, .
The intersection of A and B, , is:
What notation is used when writing out a set of elements?
E.g. Set A contains the elements 1, 2 and 3.
A set containing a number of elements is shown with the elements written inside curly brackets {}.
E.g. A = {1, 2, 3}.
True or False?
The universal set is represented by the rectangle in a Venn diagram.
True.
The universal set is represented by the rectangle in a Venn diagram.
What does the symbol represent?
is the universal set (the set of everything).
You may also see other symbols for the universal set, such as U, S or .
What does mean?
means is an element of .
is in the set , or is a member of the set .