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Which of these relations is a one-to-one function?
I. A country to its flag II. A town or municipality to its zip code III. A number to its square IV. The cost of buying a particular brand of ballpen to the number of ballpens bought
A. I and II B. I and IV C. I, II, and IV D. All of these
(please put explanation after the answer) (let us all be respectful, avoid rudeness) (please do not answer this if you don't know th right answer)
The term one-to-one relationships refers to relationships of two items in which one can only belong with the other. These relationships can be referred to in a mathematical sense, in which there are equal numbers of items, or when creating a database when one row directly corresponds to another row.
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