Give a counter$-$example to disprove that the function $"f(n)=|n|f$:$Rlongrightarrow{R}^{+}$is one$-$to$-$one".

Hint: Define $n_1$ and $n_2$ such that $n_1{n}_2$ but $f(n_1)=f(n_2).$ Your answer should contain the values of $n_1$ and $n_2.$ And you will need to show $f(n_1)=f(n_2).$

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$12$ pt $vv$ Paragraph $vv|B,B,U_{?}$