cardinal numbers
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Definition of Cardinal Numbers
The total number of elements/items in a set is called its Cardinal Number.
More about Cardinal Numbers

Order of elements does not matter in a set.
A cardinal number is a nonnegative integer.
Example of Cardinal Numbers

The cardinal number of the set A = {2, 3, 5, 7, 9} is 5.
Video Examples:Surveys and Cardinal Numbers
Solved Example on cardinal numbers
Ques: If set A = {23, c, #, II, %, 91}, then find its cardinal number.
Choices:

A. 5
B. 23
C. 91
D. 6
Correct Answer: D
Solution:

Step 1: The number of elements in a set is called its cardinal number. [Definition]
Step 2: So, cardinal number of set A is 6.
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