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WORKBOOK

Example 6: “All-natural odd numbers less than 16”

Set A is defined as above. Represent set A in three different ways.

Venn Diagram Listed form Set-builder form

A

A  ...........................................  A   |................................x 

NUMBER OF ELEMENTS OF A SET: The number of elements of a set A is denoted by n(A).

*Note: The number of elements in a set is also referred to as the cardinality of a set and is
denoted by |A|.

Example 7: Determine the number of elements of each set below.

a) A = {1, 2, a, b,  }

b) B = {y: -2  y < 5, y Z}

c) C = {1, {1,2}, {3}, }

d) D = {a, c, {c, d }, {f}, e, { }}

Example 8: A   8,4 , 12 , 16 ,..... 88  is given. What is n(A)?

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