cardinal numbers

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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