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Discrete Mathematics
Level
3
There are two sets \(X= \{ a, b, c, d \}\) and \(Y= \{ a, e, i, o, u \}\). How many of the functions whose domain is \(X\) and codomain is \(Y\), are not one-to-one?
Details and assumptions
You may choose to read up on Function Terminology.
by
Calvin Lin