Be familiar with the concept of ordinal numbers and their use to describe the numerical positions of objects.
Ordinal numbers are used to describe the position of an item in a set. For example:
- 1st
- 2nd
- 3rd
- ...
Additional Information
When objects are placed in order, ordinal numbers are used to tell their position. For example, if we have a well-ordered set S = {‘a’, ‘b’, ‘c’, ‘d’}, then ‘a’ is the 1st object, ‘b’ the 2nd, and so on.