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Discrete Mathematics Level 2

There are two sets X={a,b,c,d}X= \{ a, b, c, d \} and Y={a,e,i,o,u}Y= \{ a, e, i, o, u \}. How many of the functions whose domain is XX and codomain is YY, are not one-to-one?

Details and assumptions

You may choose to read up on Function Terminology.

Calvin Lin by Calvin Lin
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