Let $g: X \\to Y$. If $g(x_1) = g(x_2) \\iff x_1 = x_2$, which of the following is true for the function?

University of Ilorin MTH102 biochemistry past question

1. $g(x)$ is a one-to-one function
2. $g(x)$ is a many-to-one function
3. $g(x)$ is a many-to-many relation
4. $g(x)$ is a constant function

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