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Question:

Let $R=\left\{\left(a, \frac{1}{a}\right): a \in N\right.$ and $\left.1

Find the domain and range of $R$.

 

Solution:

$\operatorname{dom}(R)=\{2,3,4\}$ and range $(R)=\left\{\frac{1}{2}, \frac{1}{3}, \frac{1}{4}\right\}$

 

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