When asked to state the definition of one-to-one, a student replies, A function f is
Chapter 7, Problem 3(choose chapter or problem)
When asked to state the definition of one-to-one, a student replies, A function f is one-to-one if, and only if, every element of X is sent by f to exactly one element of Y . Give a counterexample to show that the students reply is incorrect.
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