Answer
not one-to-one
Work Step by Step
A function $f$ is a one-to-one function if different values of the domain correspond to different values of the range.
($a\neq b$ implies $f(a)\neq f(b)$)
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The domain of f contains five values (states).
Here, we have two different states from the domain,
Maine and New Hampshire
having the SAME value (2) from the range
so the function is not one-to-one
