Respuesta :
A one to one function is a function which matches exactly one x value with exactly one y value. The fancy term for this is an injective function.

The one function that matches to the one relationships of the situation where the people have equal identities as their ID numbers. The function relates to the injunctive function.
- The function is called as one to one function. The function x = f(x) maps the distinct element of the distinct functions. Such as 1 = D, 2- B, and 3 = A.
Learn more about the are matched with with unique identities.
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