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A function is a relation where one variable specifies a single value of another variable. Presenting relation and function can be done different ways including verbal, numerical, algebraic, and graphical.
A relation has pairs of numbers. A function is a special relation where for each input there is one and only one output.
A relation is a mapping from one set to another. The two sets may be the same, or different. It is an association between elements (or members) of one set with those of the other set. Some mappings are functions but mappings need not be functions.
1. One to One -function- 2. One to Many -relation- 3. Many to Many -function-
A one-to-many mapping (eg square root) Or a relation such as a member of the family. Or a relation such as narrating a story.